Call to arms: lambda-case is stuck and needs your help

Bardur Arantsson spam at
Mon Jul 9 20:09:25 CEST 2012

On 07/09/2012 06:01 PM, Mikhail Vorozhtsov wrote:
> On 07/09/2012 09:52 PM, Twan van Laarhoven wrote:
>> On 09/07/12 14:44, Simon Marlow wrote:
>>> I now think '\' is too quiet to introduce a new layout context.  The
>>> pressing
>>> need is really for a combination of '\' and 'case', that is
>>> single-argument so
>>> that we don't have to write parentheses.  I think '\case' does the job
>>> perfectly.  If you want a multi-clause multi-argument function, then
>>> give it a
>>> name.
>> There is an advantage here for "\of" in favor of "\case", namely that
>> "of" already introduces layout, while "case" does not.
> Do you think that adding "\" + "case" as a layout herald would
> complicate the language spec and/or confuse users? Because it certainly
> does not complicate the implementation (there is a patch for \case
> already).

Just being anal here, but: The existence of a patch to implement X does
not mean that X doesn't complicate the implemenatation.

... as you were.

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