#4359: Implement lambda-case/lambda-if
---------------------------------+------------------------------------------
Reporter: batterseapower | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 7.4.1
Component: Compiler | Version: 7.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by mikhail.vorozhtsov):
Replying to [comment:22 simonpj]:
{{{
> f x $ \y ->
> g y $ \z ->
> blah
}}}
Scary. It happens that I'm doing exactly that (replace {{{$}}} with
{{{>>=ᵢ}}}).
I also think that {{{\}}} is just too "small" of a token to start a new
layout.
I remember someone on the list suggesting the following syntax:
{{{
\ p1, p2 -> e1
| p3, p4 -> e2
}}}
which I find more graphic.
Why don't we just have both, as different extensions (MultiClauseLambda)?
The original proposal is about writing a good ol' {{{case}}} and letting
the compiler sugar a lambda in, and one-arg {{{\case}}} is a perfect fit
for the job.
At times like this I wish one could just upload a "plugin" package to
Hackage and let the people decide...
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:23>
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