#5934: ghc: panic! (the 'impossible' happened)
--------------------------------+-------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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GHC asked me nicely to report this compile-time panic / crash.
Minimal code:
{{{
{-# LANGUAGE Rank2Types #-}
module Foo where
import System.Random.MWC (GenST)
run :: (forall s . GenST s) -> Int
run = 0
}}}
Output:
{{{
$ ghc Foo.hs
[1 of 1] Compiling Foo ( Foo.hs, Foo.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-unknown-linux):
tcTyVarDetails
( s{tv a10F} [tv] :: ghc-prim:GHC.Prim.*{(w) tc 34d} )
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5934>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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