IIRC, Haskell has some explicit marker for adding stub functions ("doThatStuff x y z = undefined" or something like that). You still write the names for the fun

IIRC, Haskell has some explicit marker for adding stub functions ("doThatStuff x y z = undefined" or something like that). You still write the names for the function and any arguments, though. I tend to write code bottom-up rather than top-down, testing it in a REPL and/or with tests, but have Emacs functions to generate boilerplate for languages that need it.