GADT code from RepLib causes panic!
While compiling RepLib generics library I encountered a ghc panic. I have isolated the failure to very small example that does some simple computation over a heterogenous list. I have attached the following files
RepMinimal.hs. This is the problem reduced to small example. The function that seems to cause the problem is "badFunction". If I remove this function the file compiles.
RepSmall.hs. This is a trimmed down core of RepLib where the original problem occurs. I only include it if someone looking at the bug wants to know what this code was used for.
below is the output of ghc run.
[ben@lapdog RepLib]$ ghc -v RepCombined3.hs Glasgow Haskell Compiler, Version 6.10.1, for Haskell 98, stage 2 booted by GHC version 6.10.1 Using package config file: /usr/lib/ghc-6.10.1/./package.conf hiding package base-3.0.3.0 to avoid conflict with later version base-4.0.0.0 wired-in package ghc-prim mapped to ghc-prim-0.1.0.0 wired-in package integer mapped to integer-0.1.0.0 wired-in package base mapped to base-4.0.0.0 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-0.1.0.0 wired-in package template-haskell mapped to template-haskell-2.3.0.0 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: -static Created temporary directory: /tmp/ghc3284_0
- ** Checking old interface for main:Data.RepLib.RepCombined:
- ** Parser:
- ** Renamer/typechecker:
- ** Desugar:
Result size = 176
- ** Simplify:
Result size = 283
Result size = 283
- ** Tidy Core:
Result size = 283
- ** CorePrep:
Result size = 465
- ** Stg2Stg:
- ** CodeGen:
- ** CodeOutput:
- ** Deleting temp files:
Deleting: /tmp/ghc3284_0/ghc3284_0.s
- ** Deleting temp dirs:
Deleting: /tmp/ghc3284_0 ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-unknown-linux):
initC: srt_lbl
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.10.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
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