From ba306eb14615ac5e261b5f22c396b5d80f5289a0 Mon Sep 17 00:00:00 2001
From: Alexandre Ardhuin <alexandre.ardhuin@gmail.com>
Date: Wed, 17 Apr 2019 22:13:40 +0200
Subject: [PATCH] fix issue 1518

---
 lib/src/rules/unnecessary_await_in_return.dart | 2 +-
 test/rules/unnecessary_await_in_return.dart    | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/src/rules/unnecessary_await_in_return.dart b/lib/src/rules/unnecessary_await_in_return.dart
index d411989e3..9d926f5d4 100644
--- a/lib/src/rules/unnecessary_await_in_return.dart
+++ b/lib/src/rules/unnecessary_await_in_return.dart
@@ -96,7 +96,7 @@ class _Visitor extends SimpleAstVisitor<void> {
     }
     if (returnType != null &&
         returnType.isDartAsyncFuture &&
-        type.isAssignableTo(returnType)) {
+        type.isSubtypeOf(returnType)) {
       rule.reportLintForToken((expression as AwaitExpression).awaitKeyword);
     }
   }
diff --git a/test/rules/unnecessary_await_in_return.dart b/test/rules/unnecessary_await_in_return.dart
index c5179a2c1..1986ba982 100644
--- a/test/rules/unnecessary_await_in_return.dart
+++ b/test/rules/unnecessary_await_in_return.dart
@@ -56,3 +56,10 @@ class A {
     }
   }
 }
+
+// https://github.com/dart-lang/linter/issues/1518
+class B {
+  Future<num> foo() async => 1;
+  Future<int> bar() async => await foo(); // OK
+  Future<num> buzz() async => await bar(); // LINT
+}