module ShortFailingExample where


import Prelude
import Data.Maybe

z = Just (-1)

A module is imported implicitly (without an explicit import list), and there is another implicit import present (which may or may not be hiding).

Make all but at most one import explicit. In the above example we could make either Data.Maybe or Prelude explicit, e.g.

import Prelude (negate)

This error is auto-fixable.