#4359: Implement lambda-case/lambda-if
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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 claus):
Some of the syntax suggestions here scare me. But even if an unproblematic
syntax could be found, do you really want to add a complex language
construct with limited usage pattern? One nice thing about Haskell is that
it tries to keep code programmable/library-based, with only minimal
support through syntax built-ins.
I would like a 'case'-as-a-function variant, especially if it is more
basic than the current 'case-of' (ie, the 'case-of' can be defined in
terms of 'case', so the language does not get any bigger, just more
flexible).
While I'm here: have you looked at [http://hackage.haskell.org/trac
/haskell-prime/ticket/114 introduce lambda-match (explicit match failure
and fall-through)], from around the same time as lambda-case? At the time,
it was implemented as a small parser modification, with most of the
functionality in a library (see [http://hackage.haskell.org/trac/haskell-
prime/ticket/114#attachments ticket attachments] for patch, library, and
some examples), and 'case'-as-a-function was easy to implement in terms of
it. But it also supported other useful programming patterns.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4359#comment:31>
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