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.