3 ms·
Speaking of the first example, compiling it with -Wall provides some hints: $ ghc --make test.hs -Wall test.hs:1:1: Warning: Pattern match(es) are no
by jstepien 15y ago
Speaking of the first example, compiling it with -Wall provides some hints:
$ ghc --make test.hs -Wall
test.hs:1:1:
Warning: Pattern match(es) are non-exhaustive
In an equation for `fn':
Patterns not matched: #x with #x `notElem` [0#]
- teaspoon 15y agoWow, that's cool. It even works for non-Bounded argument types, as in fn [0] = 0: Warning: Pattern match(es) are non-exhaustive In an equation for `fn': Patterns not matched: [] #x : _ with #x `notElem` [0#] 0# : (_ : _)