Wanted: warning option for usages of unary minus

[Isaac Dupree]

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Simon Marlow wrote:
> I definitely think that -1# should be parsed as a single lexeme. 
> Presumably it was easier at the time to do it the way it is, I don't
> remember exactly.
> 
> I'd support a warning for use of prefix negation, or alternatively you
> could implement the Haskell' proposal to remove prefix negation
> completely - treat the unary minus as part of a numeric literal in the
> lexer only.  This would have to be optional for now, so that we can
> continue to support Haskell 98 of course.
> 
> Cheers,
>     Simon

Yes, I've been thinking about how to implement both - details will come
later when I have more time.  I think I have a reasonably working idea
of how to divide up the cases for warnings for ambiguous-looking use of
both infix and prefix minus, as well as actual syntax changes...

Isaac
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