#7423: panic on typo in deriving clause
-------------------------+--------------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Linux | Architecture: Other
Failure: None/Unknown | Blockedby:
Blocking: | Related:
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Consider the following:
data T = T deriving (eq)
Note the misspelled lower-case capital - Eq was intended instead. Rather
than reporting a syntax error, GHC panics:
mnykanen@localhost$ ghc -v -dcore-lint extest.hs
Glasgow Haskell Compiler, Version 7.4.1, stage 2 booted by GHC version
7.0.2
Using binary package database:
/home/mnykanen/bin/ghc-7.4.1/lib/ghc-7.4.1/package.conf.d/package.cache
Using binary package database:
/home/mnykanen/.ghc/x86_64-linux-7.4.1/package.conf.d/package.cache
wired-in package ghc-prim mapped to ghc-
prim-0.2.0.0-c2ff696e5b8ec4d4b2bc2e42085fe471
wired-in package integer-gmp mapped to integer-
gmp-0.4.0.0-3cccac07aef8e27023f605c1f45bdf74
wired-in package base mapped to
base-4.5.0.0-6db966b4cf8c1a91188e66d354ba065e
wired-in package rts mapped to builtin_rts
wired-in package template-haskell mapped to template-
haskell-2.7.0.0-133c0fdb189e05de22bd926d39f99fe3
wired-in package dph-seq not found.
wired-in package dph-par not found.
Hsc static flags: -static
*** Chasing dependencies:
Chasing modules from: *extest.hs
Stable obj: []
Stable BCO: []
Ready for upsweep
[NONREC
ModSummary {
ms_hs_date = Sat Nov 17 10:05:25 EET 2012
ms_mod = main:Main,
ms_textual_imps = [import (implicit) Prelude]
ms_srcimps = []
}]
*** Deleting temp files:
Deleting:
compile: input file extest.hs
Created temporary directory: /tmp/ghc2802_0
*** Checking old interface for main:Main:
[1 of 1] Compiling Main ( extest.hs, extest.o )
*** Parser:
*** Renamer/typechecker:
*** Deleting temp files:
Deleting: /tmp/ghc2802_0/ghc2802_0.s
Warning: deleting non-existent /tmp/ghc2802_0/ghc2802_0.s
*** Deleting temp dirs:
Deleting: /tmp/ghc2802_0
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-unknown-linux):
nameModule eq{tv a9I}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7423>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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