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. Regards, Takano Akio [0]: https://ghc.haskell.org/trac/ghc/ticket/10843 [1]: https://phabricator.haskell.org/D1219 [2]: https://ghc.haskell.org/trac/ghc/ticket/10843#comment:12