Redefining (~) yields a baffling error message

Running this code:

{-# LANGUAGE TypeOperators #-}
module Bug where

type (~) = Either

Yields a rather strange error:

$ /opt/ghc/8.4.3/bin/ghci Bug2.hs
GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/rgscott/.ghci
[1 of 1] Compiling Bug              ( Bug2.hs, interpreted )

Bug2.hs:4:1: error:
    Cannot redefine a Name retrieved by a Template Haskell quote: ~
  |
4 | type (~) = Either
  | ^^^^^^^^^^^^^^^^^

Since Template Haskell certainly isn't involved here.

The culprit is that (~) isn't listed within isBuiltInOcc_maybe. Patch incoming.

Trac metadata

Trac field	Value
Version	8.4.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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