[VM generic functions reification] Support generic async* and sync* functions.

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 "vm/flags.h"
 
 #ifndef DART_PRECOMPILED_RUNTIME
 
 #include "lib/invocation_mirror.h"
@@ skipping 3718 matching lines @@
         &func));  // Unpatched external function.
     end_token_pos = TokenPos();
   } else {
     UnexpectedToken();
   }
 
   ASSERT(func.end_token_pos() == func.token_pos() ||
          func.end_token_pos() == end_token_pos);
   func.set_end_token_pos(end_token_pos);
   SequenceNode* body = CloseBlock();
+  if (FLAG_reify_generic_functions && func.IsGeneric() &&
+      !generated_body_closure.IsNull()) {
+    LocalVariable* existing_var = body->scope()->LookupVariable(
+        Symbols::FunctionTypeArgumentsVar(), false);
+    ASSERT((existing_var != NULL) && existing_var->is_captured());
+  }
   if (func.IsAsyncFunction()) {
     body = CloseAsyncFunction(generated_body_closure, body);
     generated_body_closure.set_end_token_pos(end_token_pos);
   } else if (func.IsAsyncClosure()) {
     body = CloseAsyncClosure(body, end_token_pos);
   } else if (func.IsSyncGenerator()) {
     body = CloseSyncGenFunction(generated_body_closure, body);
     generated_body_closure.set_end_token_pos(end_token_pos);
   } else if (func.IsSyncGenClosure()) {
     // body is unchanged.
@@ skipping 11369 matching lines @@
 bool Parser::FieldHasFunctionLiteralInitializer(const Field& field,
                                                 TokenPosition* start,
                                                 TokenPosition* end) {
   UNREACHABLE();
   return false;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED_RUNTIME