Add optional message to assert in Dart2js.

pkg/compiler/lib/src/resolution/semantic_visitor_mixins.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.
 
 part of dart2js.semantics_visitor;
 
 /// Interface for bulk handling of a [Node] in a semantic visitor.
 abstract class BulkHandle<R, A> {
   /// Handle [node] either regardless of semantics or to report that [node] is
   /// unhandled. [message] contains a message template for the latter case:
   /// Replace '#' in [message] by `node.toString()` to create a message for the
   /// error.
   R bulkHandleNode(Node node, String message, A arg);
 }
 
 /// Mixin that implements all `errorX` methods of [SemanticSendVisitor] by
 /// delegating to a bulk handler.
 ///
 /// Use this mixin to provide a trivial implementation for all `errorX` methods.
 abstract class ErrorBulkMixin<R, A>
     implements SemanticSendVisitor<R, A>, BulkHandle<R, A> {
 
   // TODO(johnniwinther): Ensure that all error methods have an
   // [ErroneousElement].
   R bulkHandleError(Node node, ErroneousElement error, A arg) {
     return bulkHandleNode(node, "Error expression `#` unhandled.", arg);
   }
 
   @override
-  R errorInvalidAssert(
-      Send node,
-      NodeList arguments,
-      A arg) {
-    return bulkHandleError(node, null, arg);
-  }
-
-  @override
   R errorNonConstantConstructorInvoke(
       NewExpression node,
       Element element,
       DartType type,
       NodeList arguments,
       CallStructure callStructure,
       A arg) {
     return bulkHandleError(node, null, arg);
   }
 
@@ skipping 2888 matching lines @@
   @override
   R visitAs(
       Send node,
       Node expression,
       DartType type,
       A arg) {
     return bulkHandleNode(node, 'As cast `#` unhandled.', arg);
   }
 
   @override
-  R visitAssert(
-      Send node,
-      Node expression,
-      A arg) {
-    return bulkHandleNode(node, 'Assert `#` unhandled.', arg);
-  }
-
-  @override
   R visitIs(
       Send node,
       Node expression,
       DartType type,
       A arg) {
     return bulkHandleNode(node, 'Is test `#` unhandled.', arg);
   }
 
   @override
   R visitIsNot(
@@ skipping 1564 matching lines @@
   R visitAs(
       Send node,
       Node expression,
       DartType type,
       A arg) {
     apply(expression, arg);
     return null;
   }
 
   @override
-  R visitAssert(
-      Send node,
-      Node expression,
-      A arg) {
-    apply(expression, arg);
-    return null;
-  }
-
-  @override
   R visitBinary(
       Send node,
       Node left,
       BinaryOperator operator,
       Node right,
       A arg) {
     apply(left, arg);
     apply(right, arg);
     return null;
   }
@@ skipping 7824 matching lines @@
       NewExpression node,
       ConstructorElement constructor,
       InterfaceType type,
       NodeList arguments,
       CallStructure callStructure,
       A arg) {
     return handleConstructorInvoke(
         node, constructor, type, arguments, callStructure, arg);
   }
 }