my favorite nonidiomatic haskell thing i’d do was to define g (&.) f = \x -> f (g x) (you need to do some fucking around with the operator to make this work right but i forget the details) so you could write long function compositions in execution order like a shell pipeline
@aescling GHC does it! (i only know that because of a hoogle search i have not read any part of the GHC source code)
@aescling dunno. looks like it might be used in the parser? https://hoogle.haskell.org/?hoogle=(a%20%2D%3E%20b)%20%2D%3E%20(b%20%2D%3E%20c)%20%2D%3E%20a%20%2D%3E%20c&scope=set%3Astackage
annoyingly hoogle’s links do not actually work for the docs for internal GHC code
@alyssa oh i just meant that (&.) (or whatever you would call it) is very much not idiomatic
though yeah that is a preferable definition to me