' should not be a pair in haskell mode.

[colonelpanic8]

Apostrophies are often used in identifiers in haskell to indicate that something is a modified version of another thing.

Smart parens has a bunch of annoying behavior with apostrophies in haskell mode

Here is an example:

module Main where

myFunction a = a + 1

myFunction' 1 = 1
myFunction' a = myFunction a + 1

test c d = myFunction' c + (myFunction' d)

main = return ()

Running sp-splice-sexp inside of the uncessary parentheses on the test line has very suprising behavior.

EDIT:

Just noticed that smartparens-haskell has

(sp-local-pair "'" nil :unless '(sp-point-after-word-p))

Which I suspect might be why this still occurs. What is the reasoning behind this piece of config?

[Fuco1]

The config line should actually do what you want, it should disable the pair when it is at the end of the token (suck as function name with a ' at the end). However, the problem seems to be that this is not ignored in the parsing routines.

This should be somewhat simple to fix, I'll try to get it working.

[Fuco1]

Well, this was a combination of some weird bugs I've uncovered while trying to fix the haskell setup. So those are also fixed :) I've added some tests covering this report so it shouldn't repeat in the future.

[colonelpanic8]

Cool. So it's fixed?

[Fuco1]

It is now. Will be released in 1.11 but you can get it from MELPA probably in couple hours.