I just tried rebuild GHC from HEAD but the stage2 compilation of
TcSimplify failed with:
ghc.exe: panic! (the 'impossible' happened)
(GHC version 6.5 for i386-unknown-mingw32):
cat_evals
TcRnTypes.TcGblEnv{d r3Zo}
[tpl21{v ab3A} [lid], tpl31{v ab3B} [lid], tpl41{v ab3C} [lid],
tpl51{v ab3D} [lid], tpl61{v ab3E} [lid], tpl71{v ab3F} [lid],
tpl81{v ab3G} [lid], tpl91{v ab3H} [lid], tpl101{v ab3I} [lid],
tpl111{v ab3J} [lid], tpl12{v ab3K} [lid], tpl13{v ab3L} [lid],
tpl14{v ab3M} [lid], tpl15{v ab3N} [lid], tpl16{v ab3O} [lid],
tpl17{v ab3P} [lid], tpl18{v ab3Q} [lid], tpl19{v ab3R} [lid],
tpl20{v ab3S} [lid], tpl211{v ab3T} [lid], tpl22{v ab3U} [lid],
tpl23{v ab3V} [lid]]
[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _]
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Any ideas?
Krasimir
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