Support for AwaitExpression in unlinked expressions.

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

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 1825 matching lines @@
     UnlinkedClass cls = serializeClassText('''
 class C<T> {
   final x;
   const C(T) : x = T;
 }
 ''');
     _assertUnlinkedConst(cls.executables[0].constantInitializers[0].expression,
         operators: [UnlinkedExprOperation.pushParameter], strings: ['T']);
   }
 
+  test_constExpr_functionExpression() {
+    if (skipNonConstInitializers) {
+      return;
+    }
+    UnlinkedVariable variable = serializeVariableText('''
+import 'dart:async';
+const v = (f) async => await f;
+''');
+    _assertUnlinkedConst(variable.initializer.localFunctions[0].bodyExpr,
+        isValidConst: false,
+        operators: [
+          UnlinkedExprOperation.pushParameter,
+          UnlinkedExprOperation.await
+        ],
+        strings: [
+          'f'
+        ],
+        ints: []);
+  }
+
   test_constExpr_functionExpression_asArgument() {
     // Even though function expressions are not allowed in constant
     // declarations, they might occur due to erroneous code, so make sure they
     // function correctly.
     UnlinkedVariable variable = serializeVariableText('''
 const v = foo(5, () => 42);
 foo(a, b) {}
 ''');
     _assertUnlinkedConst(variable.initializer.bodyExpr,
         isValidConst: false,
@@ skipping 8516 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }