[nem-en] match on specific parameter

[d]

On Jan 29, 2006, at 8:17 AM, Michal Moskal wrote:

> However in most cases you only want to match on a single parameter
> (at least I do), so you end up writing:
>
> def rev (acc, lst)
>   match (lst)
>     | x :: xs => rev (x :: acc, xs)
>     | [] => acc

*SNIP*

> I would like something
> like:
>
> def rev (acc, match lst)
>   | x :: xs => rev (x :: acc, xs)
>   | [] => acc
>
> or maybe "def rev (acc, match)". I'm not sure about the syntax.

  Seems we feel similarly in this subject. I like both your syntax  
propositions. But there is the issue you mentioned on IRC:

< malekith> unfortunately
< malekith> Rev (acc : list ['a])
< malekith> won't work (inside some variant)
< malekith> that is you cannot say: 'Rev (match this, acc : list ['a])
< malekith> or maybe you should be able...

  I think that's reasonable, although not obvious in Nemerle.. For  
some people this will be confusing and a bit rightly so, so perhaps  
it shouldn't be allowed for [this]. I'll be statisfied whichever  
otption you choose ;]

regards,
d

PS. Sorry if this email comes out lousy, it's the first one from a  
new client ;]