#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 simonpj):
Another idea:
* With `LambdaCase`, make plain "`\`" into a layout herald.
* Allow multiple arguments as in Simon's comment above.
Something like `\x y -> x+y` would expand to `\{x y -> x+y}` so existing
code would mostly be fine, even with the extension on. But not all
existing code:
{{{
f x $ \y ->
g y $ \z ->
blah
}}}
but maybe we don't care. With the extension on you could still use
explicit curlies:
{{{
f x $ \{y ->
g y $ \{z ->
blah }}
}}}
We don't like lambda-if, so let's not do that yet.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:22>
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