@Override
      public void visitLambdaExpression(@NotNull PsiLambdaExpression lambda) {
        PsiElement body = lambda.getBody();
        if (body instanceof PsiExpression) {
          checkNulls(LambdaUtil.getFunctionalInterfaceReturnType(lambda), (PsiExpression)body,
                     JavaBundle.message("inspection.null.value.for.optional.context.lambda"));
        }
      }
@Override
      public void visitLambdaExpression(@NotNull PsiLambdaExpression lambda)