Support type variables as expressions.

sdk/lib/_internal/compiler/implementation/compiler.dart

 // 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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 123 matching lines @@
   }
 
   // The following methods are hooks for the backend to register its
   // helper methods.
   void registerInstantiatedClass(ClassElement cls, Enqueuer enqueuer) {}
   void registerStringInterpolation() {}
   void registerCatchStatement() {}
   void registerThrow() {}
   void registerLazyField() {}
   void registerTypeLiteral() {}
+  void registerTypeVariable() {}

[ngeoffray, 2013/03/11 10:24:06]

TypeVariableUsedAsExpression ?

[karlklose, 2013/03/12 09:05:02]

Renamed to registerTypeVariableExpression.

   void registerStackTraceInCatch() {}
   void registerIsCheck(DartType type, Enqueuer enqueuer) {}
   void registerAsCheck(DartType type) {}
   void registerThrowNoSuchMethod() {}
   void registerThrowRuntimeError() {}
   void registerAbstractClassInstantiation() {}
   void registerFallThroughError() {}
   void registerSuperNoSuchMethod() {}
   void registerConstantMap() {}
   void registerRuntimeType() {}
@@ skipping 1017 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }