#5362: ghc: panic! mkUsageInfo: internal name? constr_a2Py{v}
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Reporter: markwright | Owner:
Type: bug | Status: new
Priority: highest | Milestone: 7.2.1
Component: Template Haskell | Version: 7.1
Keywords: panic mkUsageInfo | Testcase:
http://hackage.haskell.org/package/syb-with-class
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Compile-time crash
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Comment(by igloo):
Ah, sorry! I hadn't noticed, but my final change had worked around the
bug. You need to have an export list:
{{{
{-# LANGUAGE TemplateHaskell #-}
module Foo () where
import Language.Haskell.TH
$(
do fName <- newName "f"
gName <- newName "g"
let gExp = varE gName
sdf <- sigD fName [t| () |]
sdg <- sigD gName [t| () |]
fdf <- funD fName [clause [] (normalB [| undefined $gExp |]) []]
fdg <- funD gName [clause [] (normalB [| undefined |]) []]
let ds = [sdf, fdf, sdg, fdg]
runIO $ putStrLn $ pprint ds
return ds
)
}}}
{{{
$ ghc --make q.hs
[1 of 1] Compiling Foo ( q.hs, q.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Loading package pretty-1.1.0.0 ... linking ... done.
Loading package array-0.3.0.3 ... linking ... done.
Loading package containers-0.4.1.0 ... linking ... done.
Loading package template-haskell ... linking ... done.
f_0 :: GHC.Unit.()
f_0 = GHC.Err.undefined g_1
g_1 :: GHC.Unit.()
g_1 = GHC.Err.undefined
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 7.2.0.20110728 for x86_64-unknown-linux):
mkUsageInfo: internal name? g_aXE{v}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5362#comment:5>
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The Glasgow Haskell Compiler
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