[Haskell-cafe] MultiCase alternative

Bram Neijt bneijt at gmail.com
Thu Jun 15 14:33:57 UTC 2017

Hi Paul,

I'm nit experienced in Haskell, so I don't have a solution. But the
following keywords spring to mind:
Ignore the syntactic sugar and see if any of the alternative syntaxes are
more flexible

Create a DSL.



On Thu, 15 Jun 2017, 16:13 Baa, <aquagnu at gmail.com> 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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