#2674: ghc panic TcPat.checkArgs
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Reporter: rwbarton | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown/Multiple | Os: Unknown/Multiple
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This program using the `derive` package:
{{{
{-# LANGUAGE TemplateHaskell, EmptyDataDecls #-}
import Data.DeriveTH
import Data.Derive.Enum
data Void
$(derive makeEnum ''Void)
}}}
produces a compiler panic:
{{{
[EMAIL PROTECTED]:~/code/haskell$ ghc --make panic
[1 of 1] Compiling Main ( panic.hs, panic.o )
Loading package base ... linking ... done.
Loading package array-0.1.0.0 ... linking ... done.
Loading package packedstring-0.1.0.0 ... linking ... done.
Loading package containers-0.1.0.1 ... linking ... done.
Loading package pretty-1.0.0.0 ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package old-locale-1.0.0.0 ... linking ... done.
Loading package old-time-1.0.0.0 ... linking ... done.
Loading package filepath-1.1.0.0 ... linking ... done.
Loading package directory-1.0.0.0 ... linking ... done.
Loading package mtl-1.1.0.1 ... linking ... done.
Loading package unix-2.3.0.0 ... linking ... done.
Loading package process-1.0.0.0 ... linking ... done.
Loading package random-1.0.0.0 ... linking ... done.
Loading package derive-0.1.1 ... linking ... done.
ghc-6.8.2: panic! (the 'impossible' happened)
(GHC version 6.8.2 for i386-unknown-linux):
TcPat.checkArgs
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
Matt Morrow has reproduced this in a ghc 6.10 prelease.
I don't particularly need a derived Enum instance for Void, but the error
message told me to report a bug.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2674>
GHC <http://www.haskell.org/ghc/>
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