[Haskell-cafe] MultiCase alternative
malcolm.wallace at me.com
Thu Jun 15 14:27:10 UTC 2017
case x of
A a -> ..
B b -> ..
C c -> f c
D d -> f d
where f cd = ...
On 15 Jun 2017, at 15:11, Baa wrote:
> Hello, Everyone!
> As I understand "MultiCase" proposal was not approved, so my question
> is: is there alternatives to multi-case? I have code like:
> case x of
> A a -> ..
> B b -> ..
> C c -> --same--
> D c -> --same--
> and I want to merge code of "C c" with "D c" branch. Anywhere, in
> general: is any alternatives to make "OR"s in patterns? I don't see how
> to do it with pattern guards, pattern synonyms, views extensions and
> don't see another related extensions.
> Something like "(C|D) c -> ..."
> Best regards, Paul
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