Make an extension flag for postfix operators
From this thread: http://www.haskell.org/pipermail/cvs-ghc/2007-November/039289.html
> 2 while looking up 8.3.7, i saw this note in 8.3.6, on > postfix operators: > > "(No Haskell 98 programs change their behaviour, of course.)" > > like so many "of course" notes, this is wrong, of course;-) > haskell98 has seq, and that makes eta-expansion observable. > > $ /cygdrive/c/ghc/ghc-6.4.1/bin/ghc -e > 'let (!) a = undefined in (undefined !) `seq` True' > True > > $ /cygdrive/c/ghc/ghc-6.6.1/bin/ghc -e > 'let (!) a = undefined in (undefined !) `seq` True' > *** Exception: Prelude.undefined Good point. We probably ought to make it an extension and give it a -X flag anyway; I don't think (without having looked at the code) it should be hard.
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