dart2js: Register helpers for updating send to type variable.

pkg/compiler/lib/src/resolution/members.dart

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index c1263d061a82db7f85e3c3e6b644ca520525fa3c..d65db4480903e7edf24f4339b38e332cccb245f9 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -1953,8 +1953,7 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
     } else {
       semantics = new StaticAccess.typeParameterTypeLiteral(element);
     }
-    registry.registerClassUsingVariableExpression(element.enclosingClass);
-    registry.registerTypeVariableExpression();
+    registry.registerTypeVariableExpression(element);
 
     registry.useElement(node, element);
     registry.registerTypeLiteral(node, element.type);
@@ -2007,6 +2006,10 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
             MessageKind.ASSIGNING_TYPE, const {});
       }
 
+      if (node.isComplex) {

[Johnni Winther, 2015/09/15 13:23:40]

Maybe add the comment: "We read the type variable before trying write to it."

+        registry.registerTypeVariableExpression(element);
+      }
+
       // TODO(23998): Remove this when all information goes through
       // the [SendStructure].
       registry.useElement(node, error);