#2367: ASSERT failed! file basicTypes/MkId.lhs line 643
-------------------------------+--------------------------------------------
Reporter: batterseapower | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.9 | Severity: normal
Keywords: | Testcase: gadt/records
Architecture: Unknown | Os: MacOS X
-------------------------------+--------------------------------------------
This is exposed by running the testsuite on a stage2 compiler with
-DDEBUG. The tests triggering it are:
* gadt/ubx-records
* gadt/records
The affected context is:
{{{
mk_alt data_con
= ASSERT2( data_ty `tcEqType` field_ty,
ppr data_con $$ ppr data_ty $$ ppr field_ty )
mkReboxingAlt rebox_uniqs data_con (ex_tvs ++ co_tvs ++ arg_vs)
rhs
where
-- get pattern binders with types appropriately instantiated
arg_uniqs = map mkBuiltinUnique [arg_base..]
(ex_tvs, co_tvs, arg_vs) = dataConOrigInstPat arg_uniqs data_con
scrut_ty_args
}}}
The precise error is:
{{{
=====> ubx-records(normal)
cd . &&
'/Users/mbolingbroke/Programming/Checkouts/ghc.working/compiler/stage2
/ghc-inplace' -fforce-recomp -dcore-lint -dcmm-lint -Di386_apple_darwin
-dno-debug-output -o ubx-records ubx-records.hs >ubx-
records.comp.stderr 2>&1
Compile failed (status 256) errors were:
ghc-6.9.20080614: panic! (the 'impossible' happened)
(GHC version 6.9.20080614 for i386-apple-darwin):
ASSERT failed! file basicTypes/MkId.lhs line 643
main:Main.T1{d r6q}
ipv_B3{tv} [tv]
a{tv a6G} [tv]
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2367>
GHC <http://www.haskell.org/ghc/>
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