RE: Hugs and _scc_ directives

[Conal Elliott]

Thanks.  Hopefully there will not be much performance overhead when 
  _scc_ str x = x

- Conal

        -----Original Message-----
        From:   Alastair Reid [SMTP:[EMAIL PROTECTED]]
        Sent:   Thursday, June 18, 1998 6:44 AM
        To:     Conal Elliott
        Cc:     '[EMAIL PROTECTED]'
        Subject:        Re: Hugs and _scc_ directives 

        > I may have already asked for this one, but in case not, please add
it to the
        > Hugs features wish list.  
        > 
        > I'd like Hugs to parse and ignore GHC-style "cost centre"
annotations.  It's
        > very tedious to insert and remove these annotations to get around
the
        > incompatibility.

        Hi Conal,

        I just implemented the Standard Haskell decision that variable names
should
        be allowed to start with _.  This means you can define your own
function
        called _scc_.  For example, I tested it with this:

          module Scc( _scc_ ) where

          import Trace(trace)

          _scc_ :: String -> a -> a
          _scc_ = trace

        I was surprised by how easy this was to do...

        Alastair

        ps _ remains a wildcard as before (as in the Standard Haskell
decision).
           This prevents code like: foo [_,_,_] = 3 from breaking.