Moving ArgumentsDo forward

[Bardur Arantsson]

On 06/01/2016 01:48 PM, Akio Takano wrote:
> Hi,
> 
> Ticket #10843 [0] proposes an extension, ArgumentsDo, which I would
> love to see in GHC. It's a small syntactic extension that allows do,
> case, if and lambda blocks as function arguments, without parentheses.
> However, its differential revision [1] has been abandoned, citing a
> mixed response from the community. A message [2] on the ticket
> summarizes a thread in haskell-cafe on this topic.
> 
> I, for one, think adding this extension is worthwhile, because a
> significant number of people support it. Also, given how some people
> seem to feel ambivalent about this change, I believe actually allowing
> people to try it makes it clearer whether it is a good idea.
> 
> Thus I'm wondering: is there any chance that this gets merged? If so,
> I'm willing to work on whatever is remaining to get the change merged.
> 

What's changed since it was last discussed? I don't think the objections
were centered in the implementation, so I don't see what "whatever is
remaining to get the change merged" would be.

AFAICT at best it's a *very* small improvement[1] and fractures Haskell
syntax even more around extensions -- tooling etc. will need to
understand even *more* syntax extensions[2].

Regards,

[1] If you grant that it is indeed an improvment, which I, personally,
don't think it is.

[2] I think most people agree that this is something that should perhaps
be handled by something like
https://github.com/haskell/haskell-ide-engine so that it would only need
to be implemented once, but there's not even an alpha release yet, so
that particular objection stands, AFAICT.