Error found:
in module Main
at tests/purs/failing/3891.purs:4:8 - 4:15 (line 4, column 8 - line 4, column 15)

  Could not match type
          
    String
          
  with type
                
    String -> t0
                

while applying a function "("
  of type String
  to argument ")"
while inferring the type of "(" ")"
in value declaration oops

where t0 is an unknown type

See https://github.com/purescript/documentation/blob/master/errors/TypesDoNotUnify.md for more information,
or to contribute content related to this error.