#3153: Panic on syntactically wrong LANGUAGE pragma
--------------------+-------------------------------------------------------
Reporter: b_jonas | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.2 | Severity: minor
Keywords: | Testcase:
Os: Linux | Architecture: x86_64 (amd64)
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I'm getting a panic from runghc. The program I'm compiling has a syntax
error in the LANGUAGE pragma, but I still think I should get an error
message instead of a panic.
I'm using ghc-6.10.2 compiled from vanilla sources (with extralibs and a
few options in build.mk) on an amd64 debian etch linux system.
Below you can see a transscript of the compilation including the panic
message, and the source code.
{{{
[am]king ~/a/tmp$ runghc Bug
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.2 for x86_64-unknown-linux):
getOptions'.parseLanguage(2) went past eof token
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
1[am]king ~/a/tmp$ cat Bug.hs
{-# LANGUAGE - #-}
main = return ();
[am]king ~/a/tmp$ cat -A Bug.hs
{-# LANGUAGE - #-}$
main = return ();$
[am]king ~/a/tmp$ gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.3.3/configure --enable-languages=c,c++
Thread model: posix
gcc version 4.3.3 (GCC)
[am]king ~/a/tmp$ runghc -v -dcore-lint Bug
Glasgow Haskell Compiler, Version 6.10.2, for Haskell 98, stage 2 booted
by GHC version 6.10.1
Using package config file: /usr/local/ghc/lib/ghc-6.10.2/./package.conf
hiding package base-3.0.3.1 to avoid conflict with later version
base-4.1.0.0
wired-in package ghc-prim mapped to ghc-prim-0.1.0.0
wired-in package integer mapped to integer-0.1.0.1
wired-in package base mapped to base-4.1.0.0
wired-in package rts mapped to rts-1.0
wired-in package haskell98 mapped to haskell98-1.0.1.0
wired-in package syb mapped to syb-0.1.0.1
wired-in package template-haskell mapped to template-haskell-2.3.0.1
wired-in package dph-seq mapped to dph-seq-0.3
wired-in package dph-par mapped to dph-par-0.3
Hsc static flags: -ignore-dot-ghci -static
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
*** Chasing dependencies:
Chasing modules from:
Stable obj: []
Stable BCO: []
unload: retaining objs []
unload: retaining bcos []
Ready for upsweep []
Upsweep completely successful.
*** Deleting temp files:
Deleting:
*** Chasing dependencies:
Chasing modules from: *Bug.hs
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.2 for x86_64-unknown-linux):
getOptions'.parseLanguage(2) went past eof token
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
*** Deleting temp files:
Deleting:
*** Deleting temp dirs:
Deleting:
1[am]king ~/a/tmp$
}}}
(I found this bug when I tried to start a program with `{-# LANGUAGE
-XPatternGuards #-}`.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3153>
GHC <http://www.haskell.org/ghc/>
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