Allow await in assert (fix issue 22728).

runtime/vm/parser.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 8614 matching lines @@
 AstNode* Parser::ParseAssertStatement() {
   TRACE_PARSER("ParseAssertStatement");
   ConsumeToken();  // Consume assert keyword.
   ExpectToken(Token::kLPAREN);
   const intptr_t condition_pos = TokenPos();
   if (!I->AssertsEnabled() && !I->TypeChecksEnabled()) {
     SkipExpr();
     ExpectToken(Token::kRPAREN);
     return NULL;
   }
-  AstNode* condition = ParseExpr(kAllowConst, kConsumeCascades);
+  AstNode* condition = ParseAwaitableExpr(kAllowConst, kConsumeCascades, NULL);
   const intptr_t condition_end = TokenPos();
   ExpectToken(Token::kRPAREN);
   condition = InsertClosureCallNodes(condition);
   condition = new(Z) UnaryOpNode(condition_pos, Token::kNOT, condition);
   AstNode* assert_throw = MakeAssertCall(condition_pos, condition_end);
   return new(Z) IfNode(
       condition_pos,
       condition,
       NodeAsSequenceNode(condition_pos, assert_throw, NULL),
       NULL);
@@ skipping 4568 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart