Fix type variables in closures.

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
index 75d644355eece6246ba3cb338c882e5e44d4f904..e1176aeadee91e90460be712c030e717275bb9bc 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
@@ -3253,8 +3253,15 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
     } else if (member.isConstructor() ||
                member.isGenerativeConstructorBody() ||
                member.isField()) {
-      // The type variable is stored in a parameter of the method.
-      return localsHandler.readLocal(type.element);
+      if (isClosure && !member.isField()) {
+        // The type variable is stored on the object and needs to be accessed
+        // using the this-reference in the closure.
+        return readTypeVariable(member.getEnclosingClass(),
+            type.element);
+      } else {
+        // The type variable is stored in a parameter of the method.
+        return localsHandler.readLocal(type.element);
+      }
     } else if (member.isInstanceMember()) {
       // The type variable is stored on the object.
       return readTypeVariable(member.getEnclosingClass(),