RE: bug with (##) operator and -fglasgow-exts, GHC 5.04, 6.0

I'm afraid you are stuck with this.  With -fglasgow-exts you do lose
some existing syntax (to give space for the new stuff) and this is one
such instance. 

        (# and #) are new punctuation for -fglasgow-exts

We do not have a place in the manual that collects all the syntax that
-fglasgow-exts captures.
If someone would like to draft one, that would be a great help and we'd
be happy to put it in.

Simon

| -----Original Message-----
| From: glasgow-haskell-bugs-admin@xxxxxxxxxxx
[mailto:glasgow-haskell-bugs-admin@xxxxxxxxxxx] On
| Behalf Of Bernard James POPE
| Sent: 06 June 2003 11:00
| To: glasgow-haskell-bugs@xxxxxxxxxxx
| Cc: Bernard James POPE
| Subject: bug with (##) operator and -fglasgow-exts, GHC 5.04, 6.0
| 
| Hi all,
| 
| I seem to remember reading about this before, but I can't
| find it, so I'm sorry if I'm repeating a known bug report.
| 
| It seems that -fglasgow-exts has trouble with (##) as an
| operator:
| 
|    module Main where
|    f ## x = f x
|    main = print $ (##) id True
| 
| It doesn't like the prefix use of (##). Infix use is fine.
| The problem goes away without -fglasgow-exts
| 
| I guess this has to do with the use of # for unboxed types
| that is introduced by -fglasgow-exts
| 
| Happens with version 6.0 and 5.04.3 (at least)
| 
| Here's the output from ghci:
| 
|    bjpop@bjpop3:/tmp$ ghci -fglasgow-exts Hash.hs
|       ___         ___ _
|      / _ \ /\  /\/ __(_)
|     / /_\// /_/ / /  | |      GHC Interactive, version 6.0, for
Haskell 98.
|    / /_\\/ __  / /___| |      http://www.haskell.org/ghc/
|    \____/\/ /_/\____/|_|      Type :? for help.
| 
|    Loading package base ... linking ... done.
|    Compiling Main             ( Hash.hs, interpreted )
|    Hash.hs:5: parse error on input `#)'
| 
| Cheers,
| Bernie.
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