hlint-3.2.4: tests/find.test

---------------------------------------------------------------------
RUN --find=tests/find.hs
FILE tests/find.hs
{-# LANGUAGE CPP, ExistentialQuantification, Rank2Types #-}

module Util where

import Control.Arrow
import Control.Monad.Trans.State
import Data.Char
import Data.Function

infixr 4 %^&, `wheeeee`

instance Foo a where
    bar = baz + qux

listM' :: Monad m => [a] -> m [a]
listM' x = length x `seq` return x

notNull = not . null

headDef :: a -> [a] -> a
headDef x [] = x
headDef x (y:ys) = y

isLeft Left{} = True; isLeft _ = False
isRight = not . isLeft

swap :: (a,b) -> (b,a)
swap (a,b) = (b,a)

defaultExtensions = knownExtensions \\ badExtensions
OUTPUT
# hints found in tests/find.hs
- fixity: "infixr 4 %^&"
- fixity: "infixr 4 `wheeeee`"
- warn: {lhs: "baz + qux", rhs: "bar"}
- warn: {lhs: "length a `seq` return a", rhs: "listM' a"}
- warn: {lhs: "not (null a)", rhs: "notNull a"}
- warn: {lhs: "not (isLeft a)", rhs: "isRight a"}
- warn: {lhs: "knownExtensions \\\\ badExtensions", rhs: "defaultExtensions"}