Via the command line I get the same problem: $ ghci -XPatternSigs PatternSig.hs GHCi, version 6.7.20070915: http://www.haskell.org/ghc/ :? for help ghc-6.7.20070915: unrecognised flags: -XPatternSigs Usage: For basic information, try the `--help' option.
$ /cygdrive/c/fptools/ghc/compiler/stage2/ghc-inplace --supported-languages | grep Pat PatternGuards PatternSignatures BangPatterns MonoPatBinds could it be that the error message is incorrect, pointing to an abbreviated form?
Illegal signature in pattern: a Use -XPatternSigs to permit it
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