the "impossible happened" while building regex-posix-0.94.4 with GHC 7

[dleuschner]

Here's the output...

Configuring regex-posix-0.94.4... Preprocessing library regex-posix-0.94.4... Building regex-posix-0.94.4... [1 of 6] Compiling Text.Regex.Posix.Wrap ( dist/build/Text/Regex/Posix/Wrap.hs, dist/build/Text/Regex/Posix/Wrap.o ) SpecConstr

Function `lvl_s2xM{v} [lid]'

has three call patterns, but the limit is 0

Use -fspec-constr-count=n to set the bound Use -dppr-debug to see specialisations

ghc: panic! (the 'impossible' happened)

(GHC version 7.0.0.20100924 for x86_64-unknown-linux):

initC: srt_lbl

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

By the way: I got lots of the "SpecConstr" warnings while building other packages.

[dleuschner]

Sorry! I just saw that this issue is already fixed. (Ticket #4345)