From f5281d62cc6408d73f8f686849acb9c946530943 Mon Sep 17 00:00:00 2001
From: Ron Buckton <ron.buckton@microsoft.com>
Date: Sat, 12 May 2018 02:07:31 -0700
Subject: [PATCH] Fix async generator rejection handling

---
 src/compiler/transformers/esnext.ts           | 10 +++--
 src/harness/compilerRunner.ts                 |  2 +-
 .../reference/asyncImportNestedYield.js       |  2 +-
 ...ter.asyncGenerators.classMethods.es2015.js | 34 ++++++++-------
 ...mitter.asyncGenerators.classMethods.es5.js | 34 ++++++++-------
 ...cGenerators.functionDeclarations.es2015.js | 30 +++++++------
 ...syncGenerators.functionDeclarations.es5.js | 30 +++++++------
 ...ncGenerators.functionExpressions.es2015.js | 30 +++++++------
 ...asyncGenerators.functionExpressions.es5.js | 30 +++++++------
 ...cGenerators.objectLiteralMethods.es2015.js | 30 +++++++------
 ...syncGenerators.objectLiteralMethods.es5.js | 30 +++++++------
 .../reference/emitter.forAwait.es2015.js      | 42 ++++++++++++-------
 .../reference/emitter.forAwait.es2017.js      | 42 ++++++++++++-------
 .../reference/emitter.forAwait.es5.js         | 42 ++++++++++++-------
 14 files changed, 229 insertions(+), 159 deletions(-)

diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
index fa5ec555ed139..d054aaaf909df 100644
--- a/src/compiler/transformers/esnext.ts
+++ b/src/compiler/transformers/esnext.ts
@@ -924,7 +924,7 @@ namespace ts {
                 return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
                 function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
                 function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-                function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+                function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
                 function fulfill(value) { resume("next", value); }
                 function reject(value) { resume("throw", value); }
                 function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -956,7 +956,7 @@ namespace ts {
             var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
                 var i, p;
                 return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-                function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+                function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
             };`
     };
 
@@ -979,8 +979,10 @@ namespace ts {
         text: `
             var __asyncValues = (this && this.__asyncValues) || function (o) {
                 if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-                var m = o[Symbol.asyncIterator];
-                return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+                var m = o[Symbol.asyncIterator], i;
+                return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+                function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+                function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
             };`
     };
 
diff --git a/src/harness/compilerRunner.ts b/src/harness/compilerRunner.ts
index 91a95e22c89d2..b899f3107c578 100644
--- a/src/harness/compilerRunner.ts
+++ b/src/harness/compilerRunner.ts
@@ -73,7 +73,7 @@ class CompilerBaselineRunner extends RunnerBase {
                 });
             });
         }
-        describe(`${this.testSuiteName} tests for ${fileName}}`, () => {
+        describe(`${this.testSuiteName} tests for ${fileName}`, () => {
             this.runSuite(fileName, test);
         });
     }
diff --git a/tests/baselines/reference/asyncImportNestedYield.js b/tests/baselines/reference/asyncImportNestedYield.js
index 776caed516788..74d6dd59629ad 100644
--- a/tests/baselines/reference/asyncImportNestedYield.js
+++ b/tests/baselines/reference/asyncImportNestedYield.js
@@ -38,7 +38,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.js b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.js
index 58dbe061d18af..821bd29afaba2 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.js
@@ -68,7 +68,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -87,7 +87,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -107,7 +107,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -122,14 +122,16 @@ class C3 {
 //// [C4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -137,7 +139,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -157,20 +159,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 class C5 {
     f() {
@@ -187,7 +191,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -207,7 +211,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -227,7 +231,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -249,7 +253,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.js b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.js
index 0387225261cd5..ed20f908dba91 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.js
@@ -95,7 +95,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -147,7 +147,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -206,7 +206,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -260,14 +260,16 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -275,7 +277,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -344,20 +346,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __values = (this && this.__values) || function (o) {
     var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
@@ -431,7 +435,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -489,7 +493,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -541,7 +545,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -606,7 +610,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.js b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.js
index 1d242f4ce6b6c..c0a16fa076b45 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.js
@@ -37,7 +37,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -54,7 +54,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -72,7 +72,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -85,14 +85,16 @@ function f3() {
 //// [F4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -100,7 +102,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -118,20 +120,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 function f5() {
     return __asyncGenerator(this, arguments, function* f5_1() {
@@ -146,7 +150,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -164,7 +168,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.js b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.js
index 88a39d18cd011..eda35c42755e0 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.js
@@ -64,7 +64,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -111,7 +111,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -165,7 +165,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -214,14 +214,16 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -229,7 +231,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -293,20 +295,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __values = (this && this.__values) || function (o) {
     var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
@@ -375,7 +379,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -428,7 +432,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.js b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.js
index 9c964275ff34e..890ab5e89b686 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.js
@@ -37,7 +37,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -54,7 +54,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -72,7 +72,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -85,14 +85,16 @@ const f3 = function () {
 //// [F4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -100,7 +102,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -118,20 +120,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 const f5 = function () {
     return __asyncGenerator(this, arguments, function* () {
@@ -146,7 +150,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -164,7 +168,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.js b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.js
index 969036e96af7a..80c790a9cdf93 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.js
@@ -64,7 +64,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -111,7 +111,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -165,7 +165,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -214,14 +214,16 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -229,7 +231,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -293,20 +295,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __values = (this && this.__values) || function (o) {
     var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
@@ -375,7 +379,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -428,7 +432,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.js b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.js
index 0f64e788b2956..43203397b0fef 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.js
@@ -51,7 +51,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -70,7 +70,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -90,7 +90,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -105,14 +105,16 @@ const o3 = {
 //// [O4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -120,7 +122,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -140,20 +142,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 const o5 = {
     f() {
@@ -170,7 +174,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -190,7 +194,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.js b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.js
index ae2174497154e..ac2930de78362 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.js
+++ b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.js
@@ -78,7 +78,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -127,7 +127,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -183,7 +183,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -234,14 +234,16 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
@@ -249,7 +251,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -315,20 +317,22 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 };
 var __values = (this && this.__values) || function (o) {
     var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
@@ -399,7 +403,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -454,7 +458,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.forAwait.es2015.js b/tests/baselines/reference/emitter.forAwait.es2015.js
index 62728018e6a85..6a29e7fad0a50 100644
--- a/tests/baselines/reference/emitter.forAwait.es2015.js
+++ b/tests/baselines/reference/emitter.forAwait.es2015.js
@@ -52,8 +52,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 function f1() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -84,8 +86,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 function f2() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -108,8 +112,10 @@ function f2() {
 //// [file3.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -118,7 +124,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -144,8 +150,10 @@ function f3() {
 //// [file4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -154,7 +162,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -188,8 +196,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 // https://github.com/Microsoft/TypeScript/issues/21363
 function f5() {
@@ -214,8 +224,10 @@ function f5() {
 //// [file6.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -224,7 +236,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.forAwait.es2017.js b/tests/baselines/reference/emitter.forAwait.es2017.js
index 2ef0812fad477..63e833e81d22d 100644
--- a/tests/baselines/reference/emitter.forAwait.es2017.js
+++ b/tests/baselines/reference/emitter.forAwait.es2017.js
@@ -44,8 +44,10 @@ async function* f6() {
 //// [file1.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 async function f1() {
     var e_1, _a;
@@ -66,8 +68,10 @@ async function f1() {
 //// [file2.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 async function f2() {
     var e_1, _a;
@@ -88,8 +92,10 @@ async function f2() {
 //// [file3.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -98,7 +104,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -124,8 +130,10 @@ function f3() {
 //// [file4.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -134,7 +142,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -160,8 +168,10 @@ function f4() {
 //// [file5.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 // https://github.com/Microsoft/TypeScript/issues/21363
 async function f5() {
@@ -184,8 +194,10 @@ async function f5() {
 //// [file6.js]
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -194,7 +206,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
diff --git a/tests/baselines/reference/emitter.forAwait.es5.js b/tests/baselines/reference/emitter.forAwait.es5.js
index ec03fdb1e27c0..b40adeb443f4c 100644
--- a/tests/baselines/reference/emitter.forAwait.es5.js
+++ b/tests/baselines/reference/emitter.forAwait.es5.js
@@ -79,8 +79,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 function f1() {
     return __awaiter(this, void 0, void 0, function () {
@@ -159,8 +161,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 function f2() {
     return __awaiter(this, void 0, void 0, function () {
@@ -231,8 +235,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -241,7 +247,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -316,8 +322,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -326,7 +334,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -409,8 +417,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 // https://github.com/Microsoft/TypeScript/issues/21363
 function f5() {
@@ -482,8 +492,10 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 };
 var __asyncValues = (this && this.__asyncValues) || function (o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
 var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
 var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
@@ -492,7 +504,7 @@ var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _ar
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }