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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #5721

Panic when quoting a scoped type variable

{-# LANGUAGE TemplateHaskell, ScopedTypeVariables #-}
module GetNameOfThing where

import Language.Haskell.TH

f :: a -> Name
f (x :: a) = ''a
ghc: panic! (the 'impossible' happened)
  (GHC version 7.2.2 for i386-unknown-linux):
	th_bracket a{tv ahF}

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

The function is probably nonsense, but the error message could be friendlier.

Tested on GHC 7.2.2.

Trac metadata
Trac field Value
Version 7.2.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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