Check for a passed-in type argument vector in the prolog of generic functions.

runtime/vm/ast.h

 // 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.
 
 #ifndef RUNTIME_VM_AST_H_
 #define RUNTIME_VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
@@ skipping 282 matching lines @@
         names_(Array::ZoneHandle()) {}
 
   ArgumentListNode(TokenPosition token_pos, const TypeArguments& type_arguments)
       : AstNode(token_pos),
         type_args_var_(NULL),
         type_arguments_(type_arguments),
         type_args_len_(type_arguments.Length()),
         nodes_(4),
         names_(Array::ZoneHandle()) {
     ASSERT(type_arguments_.IsZoneHandle());
+    ASSERT(type_arguments_.IsNull() || type_arguments_.IsCanonical());
   }
 
   ArgumentListNode(TokenPosition token_pos,
                    LocalVariable* type_args_var,
                    intptr_t type_args_len)
       : AstNode(token_pos),
         type_args_var_(type_args_var),
         type_arguments_(TypeArguments::ZoneHandle()),
         type_args_len_(type_args_len),
         nodes_(4),
@@ skipping 1699 matching lines @@
   const intptr_t try_index_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // RUNTIME_VM_AST_H_