Fix for issue 4921: ad the generic type info to a List when we create it.

lib/compiler/implementation/ssa/codegen.dart

Index: lib/compiler/implementation/ssa/codegen.dart
===================================================================
--- lib/compiler/implementation/ssa/codegen.dart	(revision 12240)
+++ lib/compiler/implementation/ssa/codegen.dart	(working copy)
@@ -2377,7 +2377,9 @@
             new js.PropertyAccess.field(pop(), typeVariable.toString());
         js.Expression genericName = new js.LiteralString("'${arguments.head}'");
         js.Binary eqTest = new js.Binary('===', field, genericName);
-        result = new js.Binary('&&', result, eqTest);
+        js.Prefix nullTest = new js.Prefix('!', field);

[kasperl, 2012/09/12 12:19:04]

Add a comment that explains why it is necessary to allow the non-exisiting type
field to pass as true? Maybe do null test before eq test? Seems a bit more
logical.

[ngeoffray, 2012/09/12 12:30:39]

Done.

+        result = new js.Binary(
+            '&&', result, new js.Binary('||', eqTest, nullTest));
       }
       push(result, node);
     }