GHC panic with operator constructor of newtype

The following code causes a GHC panic:

newtype Cont r a = Cont { (>>-) :: (a -> r) -> r }
x = \a b c -> c >>- a . b

This slight modification, however, is fine:

newtype Cont r a = Cont { (>>-) :: (a -> r) -> r }
x = \a b c -> c >>- (a . b)

The presence or absence of a type signature for x makes no difference. Compiling with "-v" suggests the panic occurs during type checking:

Glasgow Haskell Compiler, Version 8.0.2, stage 2 booted by GHC version 7.10.3
Using binary package database: /Users/bje/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d/package.cache
Using binary package database: /Users/bje/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/pkgdb/package.cache
Using binary package database: /Users/bje/.stack/global/.stack-work/install/x86_64-osx/lts-8.8/8.0.2/pkgdb/package.cache
loading package database /Users/bje/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d
loading package database /Users/bje/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/pkgdb
loading package database /Users/bje/.stack/global/.stack-work/install/x86_64-osx/lts-8.8/8.0.2/pkgdb
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0
wired-in package integer-gmp mapped to integer-gmp-1.0.0.1
wired-in package base mapped to base-4.9.1.0
wired-in package rts mapped to rts
wired-in package template-haskell mapped to template-haskell-2.11.1.0
wired-in package ghc mapped to ghc-8.0.2
wired-in package dph-seq not found.
wired-in package dph-par not found.
Hsc static flags:
loading package database /Users/bje/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d
loading package database /Users/bje/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/pkgdb
loading package database /Users/bje/.stack/global/.stack-work/install/x86_64-osx/lts-8.8/8.0.2/pkgdb
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0
wired-in package integer-gmp mapped to integer-gmp-1.0.0.1
wired-in package base mapped to base-4.9.1.0
wired-in package rts mapped to rts-1.0
wired-in package template-haskell mapped to template-haskell-2.11.1.0
wired-in package ghc mapped to ghc-8.0.2
wired-in package dph-seq not found.
wired-in package dph-par not found.
*** Chasing dependencies:
Chasing modules from: *panic.hs
!!! Chasing dependencies: finished in 0.57 milliseconds, allocated 0.224 megabytes
Stable obj: []
Stable BCO: []
Ready for upsweep
  [NONREC
      ModSummary {
         ms_hs_date = 2017-05-22 07:07:41 UTC
         ms_mod = Main,
         ms_textual_imps = [(Nothing, Prelude)]
         ms_srcimps = []
      }]
*** Deleting temp files:
Deleting:
compile: input file panic.hs
*** Checking old interface for Main:
[1 of 1] Compiling Main             ( panic.hs, panic.o )
*** Parser [Main]:
!!! Parser [Main]: finished in 0.38 milliseconds, allocated 0.209 megabytes
*** Renamer/typechecker [Main]:
*** Deleting temp files:
Deleting:
*** Deleting temp dirs:
Deleting:
ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-apple-darwin):
	get_op >>-

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	8.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture