anchor.diff:  
       b.i32_const(info.classId);
       b.i32_const(initialIdentityHash);
  -    _pushContext(functionNode);
  +    pushContext();
       b.global_get(closure.vtable);
       b.struct_new(struct);
   
  
positive.code:         lambda.function,
          ParameterInfo.fromLocalFunction(functionNode),
          "closure wrapper at ${functionNode.location}");
      w.StructType struct = closure.representation.closureStruct;
  
      ClassInfo info = translator.classInfo[translator.functionClass]!;
  
negative.code:       SuperPropertyGet node, w.ValueType expectedType) {
      Member target = _lookupSuperTarget(node.interfaceTarget, setter: false);
      if (target is Procedure && !target.isGetter) {
        // Super tear-off
        w.StructType closureStruct = _pushClosure(
            translator.getTearOffClosure(target),
            () => visitThis(w.RefType.data(nullable: false)));
        return w.RefType.def(closureStruct, nullable: false);
      }
      return _directGet(target, ThisExpression(), () => null);
    }
  