[Agda] tuple pattern sugar
kahl at cas.mcmaster.ca
Mon Jan 28 19:38:52 CET 2013
On Mon, Jan 28, 2013 at 02:02:05PM +0100, Nils Anders Danielsson wrote:
> On 2013-01-25 00:35, Darryl wrote:
> >this could actually be a good explanation of what the sugar for this stuff
> >would be.
> >for a pattern PAT
> >(PAT : A) -> B
> >desugars to
> >(x : A) -> let PAT = x in B
> >this shouldn't break anything, and could be added as an option.
> This could break existing code. For instance, "(just x : Maybe A) → …"
> currently introduces /two/ variables.
Would it work better to enforce:
"((just x) : Maybe A) → …"
, that is,
(APAT : A) -> B
where APAT is ``atomic pattern'' (variable, zero-ary constructor, parenthesised pattern)?
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