ghc-mod complains strange warnings about Template Haskell

ghc-mod.log

% ~/Library/Haskell/bin/ghc-mod check SummTest.hs 
SummTest.hs:5:14:Warning: This binding for `x' shadows the existing binding           bound at SummTest.hs:5:14
SummTest.hs:5:14:Warning: This binding for `x' shadows the existing binding           bound at SummTest.hs:5:14

% ghc -Wall SummTest.hs
[1 of 2] Compiling Summ             ( Summ.hs, Summ.o )
[2 of 2] Compiling SummTest         ( SummTest.hs, SummTest.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package pretty-1.1.1.0 ... linking ... done.
Loading package array-0.4.0.0 ... linking ... done.
Loading package deepseq-1.3.0.0 ... linking ... done.
Loading package containers-0.4.2.1 ... linking ... done.
Loading package template-haskell ... linking ... done.

SummTest.hs:6:14:
    Warning: This binding for `x' shadows the existing binding
               bound at SummTest.hs:6:14

SummTest.hs:6:14:
    Warning: This binding for `x' shadows the existing binding
               bound at SummTest.hs:6:14

% ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.4.1

% sw_vers
ProductName:    Mac OS X
ProductVersion: 10.7.4
BuildVersion:   11E53

Summ.hs

{-# LANGUAGE TemplateHaskell #-}
{- This code is copied from https://doc-0k-38-docs.googleusercontent.com/docs/securesc/aajuopgtt5qibldtm8nm9ddqvkj2htqk/3tnn2mmp1rc0kv1q7k0cvtu4m487sbn9/1341907200000/10578434965449041783/04665698165796945800/0B4BgTwf_ng_TM2MxZjJjZjctMTQ0OS00YzcwLWE5N2QtMDI0YzE4NGUwZDM3?nonce=40t1sdu1fftu4&user=04665698165796945800&hash=slcu2anrh4asf3hncs30cti9qbg5amho -}
module Summ where

import Language.Haskell.TH

summ :: Int -> Q Exp
summ n = summ' n [| 0 :: Int |]
    where
      summ' 0 code = code
      summ' n' code = [| \x -> $(summ' (n' - 1) [| $code + x :: Int |]) |]

SummTest.hs

{-# LANGUAGE TemplateHaskell #-}
module SummTest where
import Summ

sumThree :: Int -> Int -> Int -> Int
sumThree = $(summ 3)