don't try to add related diagnostic for closing bracket when parser can't find opening bracket

Author: jessetrinity

src/compiler/parser.ts

@@ -5666,9 +5666,10 @@ namespace ts {
             const hasJSDoc = hasPrecedingJSDocComment();
             parseExpected(SyntaxKind.IfKeyword);
             const openParenPosition = scanner.getTokenPos();
-            parseExpected(SyntaxKind.OpenParenToken);
+            const openParenExists = parseExpected(SyntaxKind.OpenParenToken);
             const expression = allowInAnd(parseExpression);
-            parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition);
+            openParenExists ? parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition)
+            : parseExpected(SyntaxKind.CloseBraceToken);
             const thenStatement = parseStatement();
             const elseStatement = parseOptional(SyntaxKind.ElseKeyword) ? parseStatement() : undefined;
             return withJSDoc(finishNode(factory.createIfStatement(expression, thenStatement, elseStatement), pos), hasJSDoc);
@@ -5681,9 +5682,10 @@ namespace ts {
             const statement = parseStatement();
             parseExpected(SyntaxKind.WhileKeyword);
             const openParenPosition = scanner.getTokenPos();
-            parseExpected(SyntaxKind.OpenParenToken);
+            const openParenExists = parseExpected(SyntaxKind.OpenParenToken);
             const expression = allowInAnd(parseExpression);
-            parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition);
+            openParenExists ? parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition)
+            : parseExpected(SyntaxKind.CloseParenToken);
 
             // From: https://mail.mozilla.org/pipermail/es-discuss/2011-August/016188.html
             // 157 min --- All allen at wirfs-brock.com CONF --- "do{;}while(false)false" prohibited in
@@ -5698,9 +5700,10 @@ namespace ts {
             const hasJSDoc = hasPrecedingJSDocComment();
             parseExpected(SyntaxKind.WhileKeyword);
             const openParenPosition = scanner.getTokenPos();
-            parseExpected(SyntaxKind.OpenParenToken);
+            const openParenExists = parseExpected(SyntaxKind.OpenParenToken);
             const expression = allowInAnd(parseExpression);
-            parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition);
+            openParenExists ? parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition)
+            : parseExpected(SyntaxKind.CloseParenToken);
             const statement = parseStatement();
             return withJSDoc(finishNode(factory.createWhileStatement(expression, statement), pos), hasJSDoc);
         }
@@ -5777,9 +5780,10 @@ namespace ts {
             const hasJSDoc = hasPrecedingJSDocComment();
             parseExpected(SyntaxKind.WithKeyword);
             const openParenPosition = scanner.getTokenPos();
-            parseExpected(SyntaxKind.OpenParenToken);
+            const openParenExists = parseExpected(SyntaxKind.OpenParenToken);
             const expression = allowInAnd(parseExpression);
-            parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition);
+            openParenExists ? parseExpectedMatchingBrackets(SyntaxKind.OpenParenToken, SyntaxKind.CloseParenToken, openParenPosition)
+            : parseExpected(SyntaxKind.CloseParenToken);
             const statement = doInsideOfContext(NodeFlags.InWithStatement, parseStatement);
             return withJSDoc(finishNode(factory.createWithStatement(expression, statement), pos), hasJSDoc);
         }

tests/baselines/reference/reservedWords2.errors.txt

@@ -45,7 +45,6 @@ tests/cases/compiler/reservedWords2.ts(12,17): error TS1138: Parameter declarati
 !!! error TS2580: Cannot find name 'require'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.
                                   ~
 !!! error TS1005: ')' expected.
-!!! related TS1007 tests/cases/compiler/reservedWords2.ts:1:14: The parser expected to find a ')' to match the '(' token here.
     import * as  while from "foo"
 
 !!! error TS2300: Duplicate identifier '(Missing)'.
@@ -59,7 +58,6 @@ tests/cases/compiler/reservedWords2.ts(12,17): error TS1138: Parameter declarati
 !!! error TS2304: Cannot find name 'from'.
                             ~~~~~
 !!! error TS1005: ')' expected.
-!!! related TS1007 tests/cases/compiler/reservedWords2.ts:2:20: The parser expected to find a ')' to match the '(' token here.
 
     var typeof = 10;
         ~~~~~~

tests/cases/fourslash/smartIndentMissingBracketsDoKeyword.ts

@@ -0,0 +1,7 @@
+/// <reference path='fourslash.ts'/>
+
+////do {/*1*/
+
+goTo.marker("1");
+edit.insert("\n");
+verify.indentationIs(4);

tests/cases/fourslash/smartIndentMissingBracketsIfKeyword.ts

@@ -0,0 +1,7 @@
+/// <reference path='fourslash.ts'/>
+
+////if /*1*/
+
+goTo.marker("1");
+edit.insert("\n");
+verify.indentationIs(4);

tests/cases/fourslash/smartIndentMissingBracketsWhileKeyword.ts

@@ -0,0 +1,7 @@
+/// <reference path='fourslash.ts'/>
+
+////while /*1*/
+
+goTo.marker("1");
+edit.insert("\n");
+verify.indentationIs(4);

tests/cases/fourslash/smartIndentMissingBracketsWithKeyword.ts

@@ -0,0 +1,7 @@
+/// <reference path='fourslash.ts'/>
+
+////with /*1*/
+
+goTo.marker("1");
+edit.insert("\n");
+verify.indentationIs(0);