@Override
    public PsiType fun(GrMethodCall methodCall, PsiMethod method) {
      GrExpression[] allArguments = PsiUtil.getAllArguments(methodCall);
      GrClosableBlock closure = null;

      for (GrExpression argument : allArguments) {
        if (argument instanceof GrClosableBlock) {
          closure = (GrClosableBlock)argument;
          break;
        }
      }

      if (closure == null) return null;

      final GrClosableBlock finalClosure = closure;

      return RecursionManager.doPreventingRecursion(methodCall, true, () -> {
        PsiType returnType = finalClosure.getReturnType();
        if (PsiTypes.voidType().equals(returnType)) return null;
        return returnType;
      });
    }
@Override
    public PsiType fun(GrMethodCall methodCall, PsiMethod method)