impossible happened when compiling darcs with GADTs.

[droundy@…]

ghc -DPACKAGE_NAME=\"darcs\" -DPACKAGE_TARNAME=\"darcs\" -DPACKAGE_VERSION=\"1.1.0pre1\" -DPACKAGE_STRING=\"darcs\ 1.1.0pre1\" -DPACKAGE_BUGREPORT=\"bugs@…\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DGADT_WITNESSES=1 -DHAVE_TERMIO_H=1 -cpp -package regex-compat -package QuickCheck? -package mtl -package parsec -package html -package unix -fglasgow-exts -Wall -Werror -I. -I./src -i./src -DHAVE_CURSES -DHAVE_CURL -c src/Darcs/Patch/Merge.lhs ghc-6.6: panic! (the 'impossible' happened)

(GHC version 6.6 for x86_64-unknown-linux):

splitTyConApp t_s2EA{tv} [tv] t_s2EB{tv} [tv] t_s2ED{tv} [tv]

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

[guest]

Note: to reproduce this requires a copy of not-yet-unstable code to darcs. This bug isn't hurting me yet, so unless you really want to track it down, I'll not bother tarring up a batch of source code.

David

[simonpj]

David,

Is this still happening?

Simon

[igloo]

Possibly related to #1646.

[igloo]

No response and no testcase, so I'm closing this. Please reopen and attach a testcase if it's still happening.