implement mixins in subtype checks, more codegen fixes

lib/src/js/printer.dart

Index: lib/src/js/printer.dart
diff --git a/lib/src/js/printer.dart b/lib/src/js/printer.dart
index 0b76cc62052d9cc8c15e677c987e20238378236f..3ec04eeff9007fa14bf5c981a2706a5b6dce6023 100644
--- a/lib/src/js/printer.dart
+++ b/lib/src/js/printer.dart
@@ -962,17 +962,21 @@ class Printer implements NodeVisitor {
       visit(node.heritage);
     }
     spaceOut();
-    out('{');
-    lineOut();
-    indentMore();
-    for (var method in node.methods) {
-      indent();
-      visit(method);
+    if (node.methods.isNotEmpty) {
+      out('{');
       lineOut();
+      indentMore();
+      for (var method in node.methods) {
+        indent();
+        visit(method);
+        lineOut();
+      }
+      indentLess();
+      indent();
+      out('}');
+    } else {
+      out('{}');

[Jennifer Messerly, 2015/04/01 22:31:31]

i've done this a few times but somehow keeps not ending up in my final CLs. So
here it is :)

     }
-    indentLess();
-    indent();
-    out('}');
   }
 
   visitMethod(Method node) {