Support for AwaitExpression in unlinked expressions.

pkg/analyzer/test/src/summary/resynthesize_common.dart

Index: pkg/analyzer/test/src/summary/resynthesize_common.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_common.dart b/pkg/analyzer/test/src/summary/resynthesize_common.dart
index 48293c1cceee3f49ee532298f2e75dcd6e2dcdd6..24597cd590e621bbd1e98c17f9ab68640eded78c 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_common.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_common.dart
@@ -3629,6 +3629,24 @@ var v = [f, g];
     checkLibrary('var v = () => 0;');
   }
 
+  test_initializer_executable_with_return_type_from_closure_await_dynamic() {
+    checkLibrary('var v = (f) async => await f;');
+  }
+
+  test_initializer_executable_with_return_type_from_closure_await_future_int() {
+    checkLibrary(r'''
+import 'dart:async';
+var v = (Future<int> f) async => await f;
+''');
+  }
+
+  test_initializer_executable_with_return_type_from_closure_await_future_noArg() {
+    checkLibrary(r'''
+import 'dart:async';
+var v = (Future f) async => await f;
+''');
+  }
+
   test_initializer_executable_with_return_type_from_closure_field() {
     checkLibrary('''
 class C {