Hello,
The following code, when compiled with GHC 4.08.1 under an i586
Archictecute with Red Hat Linux 6.2 produces this error message:
============================================================
ERROR MESSAGE:
Compilation Dump for: /usr/local/lib/ghc-4.08.1/hsc /tmp/ghc1430.cpp 2>>
erros -fglasgow-exts -fignore-interface-pragmas -fomit-interface-pragmas
-fsimplify [ -fmax-simplifier-iterations4 ]
-fwarn-overlapping-patterns -fwarn-missing-methods -fwarn-missing-fields
-fwarn-deprecations -fwarn-duplicate-exports -fhi-version=408 -static
"-himap=.%.hi:/usr/local/lib/ghc-4.08.1/imports/lang%.hi:/usr/local/lib/ghc-4.08.1/imports/lang%.hi:/usr/local/lib/ghc-4.08.1/imports/std%.hi"
"-himap-sep=:" -hifile=/tmp/ghc1430.hi -olang=asm
-ofile=/tmp/ghc1430.s -F=/tmp/ghc1430_stb.c -FH=/tmp/ghc1430_stb.h +RTS
-H6000000 -K1000000
rename/RnEnv.lhs:238: Non-exhaustive patterns in function get_tycon_key
==============================================================
CODE THAT PRODUCES THE ERROR
module Foo where
import MutableArray
import ByteArray
import ST
import PrelArrExtra
class Foo t where
foo :: t -> ByteArray ix
instance Ix ix => Foo (forall s. MutableByteArray s ix) where
foo x = runST(unsafeFreezeByteArray x)
================================================================
I think this code is correct (???). The error message suggests a
compiler bug. Is this true ?
Heron de Carvalho
