Fix unparse for empty initializer or conditionStatement.

lib/compiler/implementation/tree/unparser.dart

Index: lib/compiler/implementation/tree/unparser.dart
diff --git a/lib/compiler/implementation/tree/unparser.dart b/lib/compiler/implementation/tree/unparser.dart
index cf0911d10f4728d673d6c54d0471de76a8640fd3..902e37ea155147818bdac333a6b5fbf218dba1c2 100644
--- a/lib/compiler/implementation/tree/unparser.dart
+++ b/lib/compiler/implementation/tree/unparser.dart
@@ -77,6 +77,7 @@ class Unparser implements Visitor {
     add(node.forToken.value);
     sb.add('(');
     visit(node.initializer);
+    if (node.initializer is !Statement) sb.add(';');

[Anton Muhin, 2012/06/07 15:40:21]

I think it's the best variant.

node.initializer can be null, a simple expression (x = 1) or a statement.  That
covers all the cases.  We still may prefer to make EmptyStatement instead of
null for 'for(;...)', but that's a separate issue.

     visit(node.conditionStatement);
     visit(node.update);
     sb.add(')');