Throw FallThroughError when we fall through a case in a switch statement. Fixes

tree.dart

 // Copyright (c) 2011, 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.
 /**
  * The base type for all nodes in a dart abstract syntax tree.
  */
 class Node {
   /** The source code this [Node] represents. */
   SourceSpan span;
 
   Node(this.span) {}
 
   /** Classic double-dispatch visitor for implementing passes. */
-  abstract void visit(TreeVisitor visitor);

[jimhug, 2011/10/28 20:02:44]

Good catch.

+  abstract visit(TreeVisitor visitor);
 
   /** A multiline string showing the node and its children. */
   String toDebugString() {
     var to = new TreeOutput();
     var tp = new TreePrinter(to);
     this.visit(tp);
     return to.buf.toString();
   }
 }
 
@@ skipping 96 matching lines @@
         if (node != null) {
           node.visit(printer);
         } else {
           writeln('null');
         }
       }
       depth -= 1;
     }
   }
 }