This page is auto-generated from hlint --generate-summary.
| Hint Name | Hint | Severity |
|---|---|---|
| Redundant section |
Example:
issue970 = (f x +) (g x)
Found:
(f x +) (g x)
Suggestion:
f x + (g x)
|
Suggestion |
| Redundant bracket |
Example:
main = 1; {-# ANN module (1 + (2)) #-}
Found:
(2)
Suggestion:
2
|
Warning |
| Redundant bracket |
Example:
yes = (foo . bar x) <$> baz q
Found:
(foo . bar x) <$> baz q
Suggestion:
foo . bar x <$> baz q
|
Suggestion |
| Redundant $ |
Example:
no = f $ [1,2..5]
Found:
f $ [1, 2 .. 5]
Suggestion:
f [1, 2 .. 5]
|
Suggestion |
| Move brackets to avoid $ |
Example:
yes = (a b $ c d) ++ e
Found:
(a b $ c d) ++ e
Suggestion:
a b (c d) ++ e
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use pragma syntax |
Example:
{- NOINLINE Y -}
Found:
{- NOINLINE Y -}
Suggestion:
{-# NOINLINE Y #-}
|
Suggestion |
| Fix pragma markup |
Example:
{- MISSING HASH #-}
Found:
{- MISSING HASH #-}
Suggestion:
{-# MISSING HASH #-}
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use module export list |
Example:
module Foo where foo = 1
Found:
module Foo where
Suggestion: module Foo (
module Foo
) where
Does not support refactoring.
|
Ignore |
| Use explicit module export list |
Example:
module Foo(module Foo, foo) where foo = 1
Found: module Foo (
module Foo, foo
) where
Suggestion:
module Foo (
... , foo
) where
Does not support refactoring.
|
Ignore |
| Hint Name | Hint | Severity |
|---|---|---|
| Unused LANGUAGE pragma |
Example:
{-# LANGUAGE TypeData #-}
data T = MkT
Found:
{-# LANGUAGE TypeData #-}
Suggestion:
Perhaps you should remove it.
|
Warning |
| Hint Name | Hint | Severity |
|---|---|---|
| Redundant bracket due to operator fixities |
Example:
yes = (a >>= f) >>= g
Found:
(a >>= f) >>= g
Suggestion:
a >>= f >>= g
|
Ignore |
| Hint Name | Hint | Severity |
|---|---|---|
| Use fewer imports |
Example:
import A (foo) import A (bar) import A (baz)Found: import A ( foo ) import A ( bar ) import A ( baz )Suggestion: import A ( foo, bar, baz ) |
Warning |
| Redundant as |
Example:
import qualified A as A
Found:
import qualified A as A
Suggestion:
import qualified A
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use tuple-section |
Example:
yes = blah (\ x -> (y, x, z+q))
Found:
\ x -> (y, x, z + q)
Suggestion:
(y,, z + q)
Does not support refactoring. |
Suggestion |
| Use section |
Example:
f = bar (flip Foo.bar x)
Found:
(flip Foo.bar x)
Suggestion:
(`Foo.bar` x)
|
Suggestion |
| Use lambda-case |
Example:
foo = bar (\x -> case x of Y z | z > 0 -> z)
Found:
\ x -> case x of Y z | z > 0 -> z
Suggestion:
\case Y z | z > 0 -> z
Does not support refactoring. |
Suggestion |
| Use lambda |
Example:
foo = bar (\x -> case x of [y, z] -> z)
Found:
\ x -> case x of [y, z] -> z
Suggestion:
\ [y, z] -> z
|
Suggestion |
| Redundant lambda |
Example:
f = \x -> x + x
Found:
f = \ x -> x + x
Suggestion:
f x = x + x
|
Warning |
| Eta reduce |
Example:
foo a b c = bar (flux ++ quux) c where flux = a
Found:
foo a b c = bar (flux ++ quux) c
Suggestion:
foo a b = bar (flux ++ quux)
|
Warning |
| Collapse lambdas |
Example:
f = foo (\x -> \y -> \z -> x x y y z z)
Found:
\ x -> \ y -> \ z -> x x y y z z
Suggestion:
\ x y z -> x x y y z z
|
Suggestion |
| Avoid lambda using `infix` |
Example:
f = a b (\x -> c x d)
Found:
(\ x -> c x d)
Suggestion:
(`c` d)
|
Suggestion |
| Avoid lambda |
Example:
baz = bar (\x -> (x +))
Found:
\ x -> (x +)
Suggestion:
(+)
|
Warning |
| Avoid lambda |
Example:
yes = map (\f -> dataDir f) dataFiles
Found:
(\ f -> dataDir f)
Suggestion:
(dataDir )
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use list literal pattern |
Example:
yes (1:2:[]) = 1
Found:
(1 : 2 : [])
Suggestion:
[1, 2]
|
Suggestion |
| Use list literal |
Example:
yes = [1] : [2] : [3] : [4] : [5] : []
Found:
[1] : [2] : [3] : [4] : [5] : []
Suggestion:
[[1], [2], [3], [4], [5]]
|
Suggestion |
| Use String |
Example:
yes = y :: [Char] -> a
Found:
[Char] -> a
Suggestion:
String -> a
|
Ignore |
| Use : |
Example:
foo = [a b] ++ xs
Found:
[a b] ++ xs
Suggestion:
a b : xs
|
Suggestion |
| Short-circuited list comprehension |
Example:
{-# LANGUAGE MonadComprehensions #-}
foo = [x | False, x <- [1 .. 10]]
Found:
[x | False, x <- [1 .. 10]]
Suggestion:
[]
|
Suggestion |
| Redundant True guards |
Example:
foo = [myexpr | True, a]
Found:
[myexpr | True, a]
Suggestion:
[myexpr | a]
|
Suggestion |
| Move map inside list comprehension |
Example:
issue1039 = foo (map f [1 | _ <- []])
Found:
map f [1 | _ <- []]
Suggestion:
[f 1 | _ <- []]
|
Suggestion |
| Move guards forward |
Example:
foo = [x + 1 | x <- [1..10], let q = even 1, q]
Found:
[x + 1 | x <- [1 .. 10], let q = even 1, q]
Suggestion:
[x + 1 | let q = even 1, q, x <- [1 .. 10]]
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use map |
Example:
f a (x:xs) b = x + a + b : f a xs b ; f a [] b = []
Found: f a (x : xs) b = x + a + b : f a xs b f a [] b = []Suggestion:
f a xs b = map (\ x -> x + a + b) xs
|
Warning |
| Use foldr |
Example:
foos [] x = x; foos (y:ys) x = foo y $ foos ys x
Found: foos [] x = x foos (y : ys) x = foo y $ foos ys xSuggestion:
foos ys x = foldr foo x ys
|
Suggestion |
| Use foldl |
Example:
f [] y = y; f (x : xs) y = let z = g x y in f xs z
Found: f [] y = y f (x : xs) y = let z = g x y in f xs zSuggestion:
f xs y = foldl (flip g) y xs
|
Suggestion |
| Use foldM |
Example:
f (x:xs) a = a + x >>= \fax -> f xs fax ; f [] a = pure a
Found: f (x : xs) a = a + x >>= \ fax -> f xs fax f [] a = pure aSuggestion:
f xs a = foldM (+) a xs
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use mapM_ |
Example:
yes = mapM async ds >>= mapM wait >> return ()
Found:
mapM async ds >>= mapM wait
Suggestion:
mapM async ds >>= mapM_ wait
|
Warning |
| Use let |
Example:
yes = do x <- return $ y + z; foo x
Found:
x <- return $ y + z
Suggestion:
let x = y + z
|
Suggestion |
| Use join |
Example:
yes = do x <- bar; x
Found: do x <- bar xSuggestion:
do join bar
|
Warning |
| Use forM_ |
Example:
main = void (forM f xs)
Found:
void (forM f xs)
Suggestion:
forM_ f xs
|
Warning |
| Use foldM_ |
Example:
folder f a xs = foldM f a xs >>= \_ -> return ()
Found:
foldM f a xs
Suggestion:
foldM_ f a xs
|
Warning |
| Use <$> |
Example:
yes = do x <- bar; return (f $ g x)
Found: do x <- bar return (f $ g x)Suggestion:
do f . g <$> bar
|
Warning |
| Redundant void |
Example:
main = void (forM_ f xs)
Found:
void (forM_ f xs)
Suggestion:
forM_ f xs
|
Warning |
| Redundant variable capture |
Example:
main = do _ <- forM_ f xs; bar
Found:
_ <- forM_ f xs
Suggestion:
forM_ f xs
|
Warning |
| Redundant return |
Example:
main = do a; when b c; return ()
Found: do a when b c return ()Suggestion: do a when b c |
Warning |
| Redundant do |
Example:
main = do f a $ sleep 10
Found:
do
Suggestion:
Perhaps you should remove it.
|
Ignore |
| Hint Name | Hint | Severity |
|---|---|---|
| Use camelCase |
Example:
cast_foo = 1
Found:
cast_foo = ...
Suggestion:
castFoo = ...
Does not support refactoring. |
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Parenthesize unary negation |
Example:
yes = -x `mod` y
Found:
- x `mod` y
Suggestion:
- (x `mod` y)
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Use newtype instead of data |
Example:
data instance Foo Int = Bar {field :: Bool}
Found:
data instance Foo Int = Bar {field :: Bool}
Suggestion:
newtype instance Foo Int = Bar {field :: Bool}
Does not support refactoring. |
Suggestion |
| Use DerivingStrategies |
Example:
newtype instance Foo Int = Bar {field :: Bool} deriving Show
Found: newtype instance Foo Int
= Bar {field :: Bool}
deriving Show
Suggestion:
Does not support refactoring. |
Ignore |
| Hint Name | Hint | Severity |
|---|---|---|
| Use underscore |
Example:
{-# LANGUAGE NumericUnderscores #-}
3.14159265359
Found:
3.14159265359
Suggestion:
3.141_592_653_59
|
Suggestion |
| Hint Name | Hint | Severity |
|---|---|---|
| Used otherwise as a pattern |
Example:
foo otherwise = 1
Found:
otherwise
Suggestion:
_
Does not support refactoring. |
Warning |
| Use record patterns |
Example:
foo (Bar _ _ _ _) = x
Found:
Bar _ _ _ _
Suggestion:
Bar {}
|
Suggestion |
| Use otherwise |
Example:
foo x | a = b | True = d
Found: foo x | a = b | True = dSuggestion: foo x | a = b | otherwise = d |
Suggestion |
| Use guards |
Example:
foo x = yes x x where yes x y = if a then b else if c then d else e
Found:
yes x y = if a then b else if c then d else e
Suggestion: yes x y | a = b | c = d | otherwise = e |
Suggestion |
| Redundant where |
Example:
foo x = x + x where
Found:
where
Suggestion:
Perhaps you should remove it.
Does not support refactoring. |
Suggestion |
| Redundant irrefutable pattern |
Example:
foo ~x = y
Found:
~x
Suggestion:
x
|
Warning |
| Redundant guard |
Example:
foo x | otherwise = y
Found:
foo x | otherwise = y
Suggestion:
foo x = y
|
Suggestion |
| Redundant case |
Example:
foo = case v of v -> x
Found:
case v of v -> x
Suggestion:
x
|
Suggestion |
| Redundant bang pattern |
Example:
{-# LANGUAGE BangPatterns #-}; l !(() :: ()) = x
Found:
!(() :: ())
Suggestion:
(() :: ())
|
Warning |
| Redundant as-pattern |
Example:
foo x@_ = x
Found:
x@_
Suggestion:
x
|
Warning |
| Hint Name | Hint | Severity |
|---|---|---|
| Use fewer LANGUAGE pragmas |
Example:
{-# LANGUAGE RebindableSyntax #-}
{-# LANGUAGE EmptyCase, RebindableSyntax #-}
Found:
{-# LANGUAGE EmptyCase, RebindableSyntax #-}
{-# LANGUAGE RebindableSyntax #-}
Suggestion:
{-# LANGUAGE EmptyCase, RebindableSyntax #-}
|
Warning |
| Use LANGUAGE pragmas |
Example:
{-# OPTIONS_GHC -cpp -w #-}
Found: {-# OPTIONS_GHC -cpp -w #-}
Suggestion:
{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -w #-}
|
Warning |
| Hint Name | Hint | Severity |
|---|---|---|
| Missing NOINLINE pragma |
Example:
entries = unsafePerformIO . baz $ x
Found:
entries = unsafePerformIO . baz $ x
Suggestion: {-# NOINLINE entries #-}
entries = unsafePerformIO . baz $ x
|
Warning |
| Hint Name | Hint | Severity |
|---|---|---|
| Use print |
LHS:
putStrLn (show x)
RHS:
print x
|
Warning |
| Use putStrLn |
LHS:
putStr (x ++ "\n")
RHS:
putStrLn x
|
Warning |
| Use putStrLn |
LHS:
putStr (x ++ y ++ "\n")
RHS:
putStrLn (x ++ y)
|
Warning |
| Use putStr |
LHS:
mapM_ putChar
RHS:
putStr
|
Warning |
| Use getChar |
LHS:
hGetChar stdin
RHS:
getChar
|
Warning |
| Use getLine |
LHS:
hGetLine stdin
RHS:
getLine
|
Warning |
| Use getContents |
LHS:
hGetContents stdin
RHS:
getContents
|
Warning |
| Use putChar |
LHS:
hPutChar stdout
RHS:
putChar
|
Warning |
| Use putStr |
LHS:
hPutStr stdout
RHS:
putStr
|
Warning |
| Use putStrLn |
LHS:
hPutStrLn stdout
RHS:
putStrLn
|
Warning |
| Use print |
LHS:
hPrint stdout
RHS:
print
|
Warning |
| Use hReady |
LHS:
hWaitForInput a 0
RHS:
hReady a
|
Warning |
| Use hPrint |
LHS:
hPutStrLn a (show b)
RHS:
hPrint a b
|
Warning |
| Use isEOF |
LHS:
hIsEOF stdin
RHS:
isEOF
|
Warning |
| Use writeFile |
LHS:
withFile f WriteMode (\ h -> hPutStr h x)
RHS:
writeFile f x
|
Warning |
| Use writeFile |
LHS:
withFile f WriteMode (\ h -> hPutStrLn h x)
RHS:
writeFile f (x ++ "\n")
|
Warning |
| Use appendFile |
LHS:
withFile f AppendMode (\ h -> hPutStr h x)
RHS:
appendFile f x
|
Warning |
| Use appendFile |
LHS:
withFile f AppendMode (\ h -> hPutStrLn h x)
RHS:
appendFile f (x ++ "\n")
|
Warning |
| Use exitSuccess |
LHS:
exitWith ExitSuccess
RHS:
exitSuccess
|
Warning |
| Use /= |
LHS:
not (a == b)
RHS:
a /= b
|
Warning |
| Use == |
LHS:
not (a /= b)
RHS:
a == b
|
Warning |
| Use <= |
LHS:
not (a > b)
RHS:
a <= b
|
Warning |
| Use < |
LHS:
not (a >= b)
RHS:
a < b
|
Warning |
| Use >= |
LHS:
not (a < b)
RHS:
a >= b
|
Warning |
| Use > |
LHS:
not (a <= b)
RHS:
a > b
|
Warning |
| Use <= |
LHS:
compare x y /= GT
RHS:
x <= y
|
Warning |
| Use < |
LHS:
compare x y == LT
RHS:
x < y
|
Warning |
| Use >= |
LHS:
compare x y /= LT
RHS:
x >= y
|
Warning |
| Use > |
LHS:
compare x y == GT
RHS:
x > y
|
Warning |
| Redundant compare |
LHS:
compare x y == EQ
RHS:
x == y
|
Warning |
| Redundant compare |
LHS:
compare x y /= EQ
RHS:
x /= y
|
Warning |
| Use minimum |
LHS:
head (sort x)
RHS:
minimum x
|
Warning |
| Use maximum |
LHS:
last (sort x)
RHS:
maximum x
|
Warning |
| Use minimumBy |
LHS:
head (sortBy f x)
RHS:
minimumBy f x
|
Warning |
| Use maximumBy |
LHS:
last (sortBy f x)
RHS:
maximumBy f x
|
Warning |
| Avoid reverse |
LHS:
reverse (sortBy f x)
RHS:
sortBy (flip f) x
|
Warning |
| Use Down |
LHS:
sortBy (flip (comparing f))
RHS:
sortBy (comparing (Data.Ord.Down . f))
|
Warning |
| Avoid reverse |
LHS:
reverse (sortOn f x)
RHS:
sortOn (Data.Ord.Down . f) x
|
Warning |
| Avoid reverse |
LHS:
reverse (sort x)
RHS:
sortBy (comparing Data.Ord.Down) x
|
Warning |
| Move flip |
LHS:
flip (g `on` h)
RHS:
flip g `on` h
|
Suggestion |
| Fuse on/on |
LHS:
(f `on` g) `on` h
RHS:
f `on` (g . h)
|
Suggestion |
| Use max |
LHS:
if a >= b then a else b
RHS:
max a b
|
Warning |
| Use min |
LHS:
if a >= b then b else a
RHS:
min a b
|
Warning |
| Use max |
LHS:
if a > b then a else b
RHS:
max a b
|
Warning |
| Use min |
LHS:
if a > b then b else a
RHS:
min a b
|
Warning |
| Use min |
LHS:
if a <= b then a else b
RHS:
min a b
|
Warning |
| Use max |
LHS:
if a <= b then b else a
RHS:
max a b
|
Warning |
| Use min |
LHS:
if a < b then a else b
RHS:
min a b
|
Warning |
| Use max |
LHS:
if a < b then b else a
RHS:
max a b
|
Warning |
| Use max |
LHS:
maximum [a, b]
RHS:
max a b
|
Warning |
| Use min |
LHS:
minimum [a, b]
RHS:
min a b
|
Warning |
| Use show |
LHS:
showsPrec 0 x ""
RHS:
show x
|
Warning |
| Use show |
LHS:
showsPrec 0 x []
RHS:
show x
|
Warning |
| Use reads |
LHS:
readsPrec 0
RHS:
reads
|
Warning |
| Use shows |
LHS:
showsPrec 0
RHS:
shows
|
Warning |
| Use showHex |
LHS:
showIntAtBase 16 intToDigit
RHS:
showHex
|
Suggestion |
| Use showOct |
LHS:
showIntAtBase 8 intToDigit
RHS:
showOct
|
Suggestion |
| Use concatMap |
LHS:
concat (map f x)
RHS:
concatMap f x
|
Warning |
| Use concatMap |
LHS:
concat (f <$> x)
RHS:
concatMap f x
|
Warning |
| Use concatMap |
LHS:
concat (x <&> f)
RHS:
concatMap f x
|
Warning |
| Use concatMap |
LHS:
concat (fmap f x)
RHS:
concatMap f x
|
Warning |
| Use ++ |
LHS:
concat [a, b]
RHS:
a ++ b
|
Suggestion |
| Use map once |
LHS:
map f (map g x)
RHS:
map (f . g) x
|
Suggestion |
| Fuse concatMap/map |
LHS:
concatMap f (map g x)
RHS:
concatMap (f . g) x
|
Suggestion |
| Use head |
LHS:
x !! 0
RHS:
head x
|
Suggestion |
| Use replicate |
LHS:
take n (repeat x)
RHS:
replicate n x
|
Warning |
| Redundant map |
LHS:
map f (replicate n x)
RHS:
replicate n (f x)
|
Warning |
| Redundant map |
LHS:
map f (repeat x)
RHS:
repeat (f x)
|
Warning |
| Use cycle |
LHS:
concatMap f (repeat x)
RHS:
cycle (f x)
|
Warning |
| Use cycle |
LHS:
concat (repeat x)
RHS:
cycle x
|
Warning |
| Use repeat |
LHS:
cycle [x]
RHS:
repeat x
|
Warning |
| Use last |
LHS:
head (reverse x)
RHS:
last x
|
Warning |
| Use head |
LHS:
last (reverse x)
RHS:
head x
|
Warning |
| Use !! |
LHS:
head (drop n x)
RHS:
x !! n
|
Warning |
| Use !! |
LHS:
head (drop n x)
RHS:
x !! max 0 n
|
Warning |
| Use tail |
LHS:
reverse (init x)
RHS:
tail (reverse x)
|
Warning |
| Use init |
LHS:
reverse (tail (reverse x))
RHS:
init x
|
Warning |
| Avoid reverse |
LHS:
reverse (reverse x)
RHS:
x
|
Warning |
| Use isSuffixOf |
LHS:
isPrefixOf (reverse x) (reverse y)
RHS:
isSuffixOf x y
|
Warning |
| Use concat |
LHS:
foldr (++) []
RHS:
concat
|
Warning |
| Use concat |
LHS:
foldr (++) ""
RHS:
concat
|
Warning |
| Use concatMap |
LHS:
foldr ((++) . f) []
RHS:
concatMap f
|
Warning |
| Use concatMap |
LHS:
foldr ((++) . f) ""
RHS:
concatMap f
|
Warning |
| Use concat |
LHS:
foldl (++) []
RHS:
concat
|
Warning |
| Use concat |
LHS:
foldl (++) ""
RHS:
concat
|
Warning |
| Use foldl1 |
LHS:
foldl f (head x) (tail x)
RHS:
foldl1 f x
|
Warning |
| Use foldr1 |
LHS:
foldr f (last x) (init x)
RHS:
foldr1 f x
|
Warning |
| Use map |
LHS:
foldr (\ c a -> x : a) []
RHS:
map (\ c -> x)
|
Warning |
| Use $ |
LHS:
foldr (.) id l z
RHS:
foldr ($) z l
|
Warning |
| Use break |
LHS:
span (not . p)
RHS:
break p
|
Warning |
| Use span |
LHS:
break (not . p)
RHS:
span p
|
Warning |
| Use break |
LHS:
span (notElem x)
RHS:
break (elem x)
|
Warning |
| Use span |
LHS:
break (notElem x)
RHS:
span (elem x)
|
Warning |
| Use span |
LHS:
(takeWhile p x, dropWhile p x)
RHS:
span p x
|
Warning |
| Use takeWhile |
LHS:
fst (span p x)
RHS:
takeWhile p x
|
Warning |
| Use dropWhile |
LHS:
snd (span p x)
RHS:
dropWhile p x
|
Warning |
| Use takeWhile |
LHS:
fst (break p x)
RHS:
takeWhile (not . p) x
|
Warning |
| Use dropWhile |
LHS:
snd (break p x)
RHS:
dropWhile (not . p) x
|
Warning |
| Use splitAt |
LHS:
(take n x, drop n x)
RHS:
splitAt n x
|
Warning |
| Use take |
LHS:
fst (splitAt p x)
RHS:
take p x
|
Warning |
| Use drop |
LHS:
snd (splitAt p x)
RHS:
drop p x
|
Warning |
| Use unlines |
LHS:
concatMap (++ "\n")
RHS:
unlines
|
Warning |
| Redundant map |
LHS:
map id
RHS:
id
|
Warning |
| Use concat |
LHS:
concatMap id
RHS:
concat
|
Warning |
| Use any |
LHS:
or (map p x)
RHS:
any p x
|
Warning |
| Use all |
LHS:
and (map p x)
RHS:
all p x
|
Warning |
| Redundant map |
LHS:
any f (map g x)
RHS:
any (f . g) x
|
Warning |
| Redundant map |
LHS:
all f (map g x)
RHS:
all (f . g) x
|
Warning |
| Use zip |
LHS:
zipWith (,)
RHS:
zip
|
Warning |
| Use zip3 |
LHS:
zipWith3 (,,)
RHS:
zip3
|
Warning |
| Use unzip |
LHS:
map fst &&& map snd
RHS:
unzip
|
Suggestion |
| Use null |
LHS:
length x == 0
RHS:
null x
|
Suggestion |
| Use null |
LHS:
0 == length x
RHS:
null x
|
Suggestion |
| Use null |
LHS:
length x < 1
RHS:
null x
|
Suggestion |
| Use null |
LHS:
1 > length x
RHS:
null x
|
Suggestion |
| Use null |
LHS:
length x <= 0
RHS:
null x
|
Suggestion |
| Use null |
LHS:
0 >= length x
RHS:
null x
|
Suggestion |
| Use null |
LHS:
x == []
RHS:
null x
|
Suggestion |
| Use null |
LHS:
[] == x
RHS:
null x
|
Suggestion |
| Use null |
LHS:
all (const False)
RHS:
null
|
Suggestion |
| Use null |
LHS:
any (const True) x
RHS:
not (null x)
|
Suggestion |
| Use null |
LHS:
length x /= 0
RHS:
not (null x)
|
Suggestion |
| Use null |
LHS:
0 /= length x
RHS:
not (null x)
|
Suggestion |
| Use : |
LHS:
\ x -> [x]
RHS:
(: [])
|
Suggestion |
| Use zipWith |
LHS:
map f (zip x y)
RHS:
zipWith (curry f) x y
|
Suggestion |
| Use maybe |
LHS:
map f (fromMaybe [] x)
RHS:
maybe [] (map f) x
|
Suggestion |
| Use maybe |
LHS:
concatMap f (fromMaybe [] x)
RHS:
maybe [] (concatMap f) x
|
Suggestion |
| Use maybe |
LHS:
concat (fromMaybe [] x)
RHS:
maybe [] concat x
|
Suggestion |
| Use notElem |
LHS:
not (elem x y)
RHS:
notElem x y
|
Warning |
| Use elem |
LHS:
not (notElem x y)
RHS:
elem x y
|
Warning |
| Fuse foldr/map |
LHS:
foldr f z (map g x)
RHS:
foldr (f . g) z x
|
Suggestion |
| Use unwords |
LHS:
x ++ concatMap (' ' :) y
RHS:
unwords (x : y)
|
Warning |
| Use unwords |
LHS:
intercalate " "
RHS:
unwords
|
Warning |
| Use intercalate |
LHS:
concat (intersperse x y)
RHS:
intercalate x y
|
Suggestion |
| Use unwords |
LHS:
concat (intersperse " " x)
RHS:
unwords x
|
Suggestion |
| Use all |
LHS:
null (concat x)
RHS:
all null x
|
Warning |
| Use any |
LHS:
null (filter f x)
RHS:
not (any f x)
|
Warning |
| Use any |
LHS:
filter f x == []
RHS:
not (any f x)
|
Warning |
| Use any |
LHS:
filter f x /= []
RHS:
any f x
|
Warning |
| Use or |
LHS:
any id
RHS:
or
|
Warning |
| Use and |
LHS:
all id
RHS:
and
|
Warning |
| Hoist not |
LHS:
any (not . f) x
RHS:
not (all f x)
|
Warning |
| Hoist not |
LHS:
all (not . f) x
RHS:
not (any f x)
|
Warning |
| Use elem |
LHS:
any ((==) a)
RHS:
elem a
|
Warning |
| Use elem |
LHS:
any (== a)
RHS:
elem a
|
Warning |
| Use elem |
LHS:
any (a ==)
RHS:
elem a
|
Warning |
| Use notElem |
LHS:
all ((/=) a)
RHS:
notElem a
|
Warning |
| Use notElem |
LHS:
all (/= a)
RHS:
notElem a
|
Warning |
| Use notElem |
LHS:
all (a /=)
RHS:
notElem a
|
Warning |
| Use or |
LHS:
elem True
RHS:
or
|
Warning |
| Use and |
LHS:
notElem False
RHS:
and
|
Warning |
| Use or |
LHS:
True `elem` l
RHS:
or l
|
Warning |
| Use and |
LHS:
False `notElem` l
RHS:
and l
|
Warning |
| Use any |
LHS:
elem False
RHS:
any not
|
Warning |
| Use all |
LHS:
notElem True
RHS:
all not
|
Warning |
| Use any |
LHS:
False `elem` l
RHS:
any not l
|
Warning |
| Use all |
LHS:
True `notElem` l
RHS:
all not l
|
Warning |
| Use elemIndex |
LHS:
findIndex ((==) a)
RHS:
elemIndex a
|
Warning |
| Use elemIndex |
LHS:
findIndex (a ==)
RHS:
elemIndex a
|
Warning |
| Use elemIndex |
LHS:
findIndex (== a)
RHS:
elemIndex a
|
Warning |
| Use elemIndices |
LHS:
findIndices ((==) a)
RHS:
elemIndices a
|
Warning |
| Use elemIndices |
LHS:
findIndices (a ==)
RHS:
elemIndices a
|
Warning |
| Use elemIndices |
LHS:
findIndices (== a)
RHS:
elemIndices a
|
Warning |
| Use elemIndex |
LHS:
lookup b (zip l [0 .. ])
RHS:
elemIndex b l
|
Warning |
| Use == |
LHS:
elem x [y]
RHS:
x == y
|
Suggestion |
| Use /= |
LHS:
notElem x [y]
RHS:
x /= y
|
Suggestion |
| Use max |
LHS:
length [1 .. n]
RHS:
max 0 n
|
Suggestion |
| Length always non-negative |
LHS:
length x >= 0
RHS:
True
|
Suggestion |
| Length always non-negative |
LHS:
0 <= length x
RHS:
True
|
Suggestion |
| Use null |
LHS:
length x > 0
RHS:
not (null x)
|
Suggestion |
| Use null |
LHS:
0 < length x
RHS:
not (null x)
|
Suggestion |
| Use null |
LHS:
length x >= 1
RHS:
not (null x)
|
Suggestion |
| Use null |
LHS:
1 <= length x
RHS:
not (null x)
|
Suggestion |
| Take on a non-positive |
LHS:
take i x
RHS:
[]
|
Warning |
| Drop on a non-positive |
LHS:
drop i x
RHS:
x
|
Warning |
| Use foldl |
LHS:
last (scanl f z x)
RHS:
foldl f z x
|
Warning |
| Use foldr |
LHS:
head (scanr f z x)
RHS:
foldr f z x
|
Warning |
| Use take |
LHS:
scanl (\ x _ -> a) b (replicate c d)
RHS:
take c (iterate (\ x -> a) b)
|
Warning |
| Use iterate |
LHS:
foldl (\ x _ -> a) b [1 .. c]
RHS:
iterate (\ x -> a) b !! c
|
Warning |
| Use repeat |
LHS:
iterate id
RHS:
repeat
|
Warning |
| Use map |
LHS:
zipWith f (repeat x)
RHS:
map (f x)
|
Warning |
| Use map with tuple-section |
LHS:
zip (repeat x)
RHS:
map (_noParen_ x,)
|
Warning |
| Use map |
LHS:
zipWith f y (repeat z)
RHS:
map (`f` z) y
|
Warning |
| Use map with tuple-section |
LHS:
zip y (repeat z)
RHS:
map (, _noParen_ z) y
|
Warning |
| Use find |
LHS:
listToMaybe (filter p x)
RHS:
find p x
|
Warning |
| Redundant take |
LHS:
zip (take n x) (take n y)
RHS:
take n (zip x y)
|
Warning |
| Redundant take |
LHS:
zip (take n x) (take m y)
RHS:
take (min n m) (zip x y)
|
Warning |
| Monoid law, left identity |
LHS:
mempty <> x
RHS:
x
|
Warning |
| Monoid law, left identity |
LHS:
mempty `mappend` x
RHS:
x
|
Warning |
| Monoid law, right identity |
LHS:
x <> mempty
RHS:
x
|
Warning |
| Monoid law, right identity |
LHS:
x `mappend` mempty
RHS:
x
|
Warning |
| Use fold |
LHS:
foldr (<>) mempty
RHS:
Data.Foldable.fold
|
Warning |
| Use fold |
LHS:
foldr mappend mempty
RHS:
Data.Foldable.fold
|
Warning |
| Evaluate |
LHS:
mempty x
RHS:
mempty
|
Warning |
| Evaluate |
LHS:
x `mempty` y
RHS:
mempty
|
Warning |
| Traversable law |
LHS:
traverse pure
RHS:
pure
|
Warning |
| Traversable law |
LHS:
traverse (pure . f) x
RHS:
pure (fmap f x)
|
Warning |
| Use traverse |
LHS:
sequenceA (map f x)
RHS:
traverse f x
|
Warning |
| Use traverse |
LHS:
sequenceA (f <$> x)
RHS:
traverse f x
|
Warning |
| Use traverse |
LHS:
sequenceA (x <&> f)
RHS:
traverse f x
|
Warning |
| Use traverse |
LHS:
sequenceA (fmap f x)
RHS:
traverse f x
|
Warning |
| Use traverse_ |
LHS:
sequenceA_ (map f x)
RHS:
traverse_ f x
|
Warning |
| Use traverse_ |
LHS:
sequenceA_ (f <$> x)
RHS:
traverse_ f x
|
Warning |
| Use traverse_ |
LHS:
sequenceA_ (x <&> f)
RHS:
traverse_ f x
|
Warning |
| Use traverse_ |
LHS:
sequenceA_ (fmap f x)
RHS:
traverse_ f x
|
Warning |
| Use fold |
LHS:
foldMap id
RHS:
fold
|
Warning |
| Use foldMap |
LHS:
fold (f <$> x)
RHS:
foldMap f x
|
Warning |
| Use foldMap |
LHS:
fold (x <&> f)
RHS:
foldMap f x
|
Warning |
| Use foldMap |
LHS:
fold (fmap f x)
RHS:
foldMap f x
|
Warning |
| Use foldMap |
LHS:
fold (map f x)
RHS:
foldMap f x
|
Warning |
| Fuse foldMap/<$> |
LHS:
foldMap f (g <$> x)
RHS:
foldMap (f . g) x
|
Warning |
| Fuse foldMap/<&> |
LHS:
foldMap f (x <&> g)
RHS:
foldMap (f . g) x
|
Warning |
| Fuse foldMap/fmap |
LHS:
foldMap f (fmap g x)
RHS:
foldMap (f . g) x
|
Warning |
| Fuse foldMap/map |
LHS:
foldMap f (map g x)
RHS:
foldMap (f . g) x
|
Warning |
| Fuse traverse/fmap |
LHS:
traverse f (fmap g x)
RHS:
traverse (f . g) x
|
Warning |
| Fuse traverse/<$> |
LHS:
traverse f (g <$> x)
RHS:
traverse (f . g) x
|
Warning |
| Fuse traverse/<&> |
LHS:
traverse f (x <&> g)
RHS:
traverse (f . g) x
|
Warning |
| Fuse traverse_/fmap |
LHS:
traverse_ f (fmap g x)
RHS:
traverse_ (f . g) x
|
Warning |
| Fuse traverse_/<$> |
LHS:
traverse_ f (g <$> x)
RHS:
traverse_ (f . g) x
|
Warning |
| Fuse traverse_/<&> |
LHS:
traverse_ f (x <&> g)
RHS:
traverse_ (f . g) x
|
Warning |
| Use delete |
LHS:
deleteBy (==)
RHS:
delete
|
Warning |
| Use group |
LHS:
groupBy (==)
RHS:
group
|
Warning |
| Use insert |
LHS:
insertBy compare
RHS:
insert
|
Warning |
| Use intersect |
LHS:
intersectBy (==)
RHS:
intersect
|
Warning |
| Use maximum |
LHS:
maximumBy compare
RHS:
maximum
|
Warning |
| Use minimum |
LHS:
minimumBy compare
RHS:
minimum
|
Warning |
| Use nub |
LHS:
nubBy (==)
RHS:
nub
|
Warning |
| Use sort |
LHS:
sortBy compare
RHS:
sort
|
Warning |
| Use union |
LHS:
unionBy (==)
RHS:
union
|
Warning |
| Use sequence_ |
LHS:
foldr (>>) (pure ())
RHS:
sequence_
|
Warning |
| Use sequence_ |
LHS:
foldr (>>) (return ())
RHS:
sequence_
|
Warning |
| Use and |
LHS:
foldr (&&) True
RHS:
and
|
Warning |
| Use and |
LHS:
foldl (&&) True
RHS:
and
|
Warning |
| Use and |
LHS:
foldr1 (&&)
RHS:
and
|
Warning |
| Use and |
LHS:
foldl1 (&&)
RHS:
and
|
Warning |
| Use or |
LHS:
foldr (||) False
RHS:
or
|
Warning |
| Use or |
LHS:
foldl (||) False
RHS:
or
|
Warning |
| Use or |
LHS:
foldr1 (||)
RHS:
or
|
Warning |
| Use or |
LHS:
foldl1 (||)
RHS:
or
|
Warning |
| Use sum |
LHS:
foldl (+) 0
RHS:
sum
|
Warning |
| Use sum |
LHS:
foldr (+) 0
RHS:
sum
|
Warning |
| Use sum |
LHS:
foldl1 (+)
RHS:
sum
|
Warning |
| Use sum |
LHS:
foldr1 (+)
RHS:
sum
|
Warning |
| Use product |
LHS:
foldl (*) 1
RHS:
product
|
Warning |
| Use product |
LHS:
foldr (*) 1
RHS:
product
|
Warning |
| Use product |
LHS:
foldl1 (*)
RHS:
product
|
Warning |
| Use product |
LHS:
foldr1 (*)
RHS:
product
|
Warning |
| Use maximum |
LHS:
foldl1 max
RHS:
maximum
|
Warning |
| Use maximum |
LHS:
foldr1 max
RHS:
maximum
|
Warning |
| Use minimum |
LHS:
foldl1 min
RHS:
minimum
|
Warning |
| Use minimum |
LHS:
foldr1 min
RHS:
minimum
|
Warning |
| Use msum |
LHS:
foldr mplus mzero
RHS:
msum
|
Warning |
| Use id |
LHS:
\ x -> x
RHS:
id
|
Warning |
| Use const |
LHS:
\ x y -> x
RHS:
const
|
Warning |
| Use const |
LHS:
curry fst
RHS:
const
|
Warning |
| Redundant curry |
LHS:
curry snd
RHS:
\ _ x -> x
|
Warning |
| Redundant flip |
LHS:
flip const
RHS:
\ _ x -> x
|
Warning |
| Use snd |
LHS:
\ (x, y) -> y
RHS:
snd
|
Warning |
| Use fst |
LHS:
\ (x, y) -> x
RHS:
fst
|
Warning |
| Use curry |
LHS:
\ x y -> f (x, y)
RHS:
curry f
|
Suggestion |
| Use uncurry |
LHS:
\ (x, y) -> f x y
RHS:
uncurry f
|
Suggestion |
| Use uncurry |
LHS:
f (fst p) (snd p)
RHS:
uncurry f p
|
Warning |
| Redundant uncurry |
LHS:
uncurry (\ x y -> z)
RHS:
\ (x, y) -> z
|
Warning |
| Redundant curry |
LHS:
curry (\ (x, y) -> z)
RHS:
\ x y -> z
|
Warning |
| Redundant uncurry |
LHS:
uncurry (curry f)
RHS:
f
|
Warning |
| Redundant curry |
LHS:
curry (uncurry f)
RHS:
f
|
Warning |
| Redundant uncurry |
LHS:
uncurry f (a, b)
RHS:
f a b
|
Warning |
| Redundant $ |
LHS:
($) (f x)
RHS:
f x
|
Warning |
| Redundant $ |
LHS:
(f $)
RHS:
f
|
Warning |
| Redundant & |
LHS:
(& f)
RHS:
f
|
Warning |
| Use const |
LHS:
\ x -> y
RHS:
const y
|
Suggestion |
| Redundant flip |
LHS:
flip f x y
RHS:
f y x
|
Warning |
| Redundant id |
LHS:
id x
RHS:
x
|
Warning |
| Redundant id |
LHS:
id . x
RHS:
x
|
Warning |
| Redundant id |
LHS:
x . id
RHS:
x
|
Warning |
| Use tuple-section |
LHS:
((,) x)
RHS:
(_noParen_ x,)
|
Warning |
| Use tuple-section |
LHS:
flip (,) x
RHS:
(, _noParen_ x)
|
Warning |
| Redundant flip |
LHS:
flip (flip f)
RHS:
f
|
Warning |
| Redundant flip |
LHS:
flip f <*> g
RHS:
f =<< g
|
Warning |
| Redundant flip |
LHS:
g <**> flip f
RHS:
g >>= f
|
Warning |
| Redundant flip |
LHS:
flip f =<< g
RHS:
f <*> g
|
Warning |
| Redundant flip |
LHS:
g >>= flip f
RHS:
g Control.Applicative.<**> f
|
Warning |
| Use isAsciiLower |
LHS:
a >= 'a' && a <= 'z'
RHS:
isAsciiLower a
|
Warning |
| Use isAsciiLower |
LHS:
'a' <= a && a <= 'z'
RHS:
isAsciiLower a
|
Warning |
| Use isAsciiUpper |
LHS:
a >= 'A' && a <= 'Z'
RHS:
isAsciiUpper a
|
Warning |
| Use isAsciiUpper |
LHS:
'A' <= a && a <= 'Z'
RHS:
isAsciiUpper a
|
Warning |
| Use isDigit |
LHS:
a >= '0' && a <= '9'
RHS:
isDigit a
|
Warning |
| Use isDigit |
LHS:
'0' <= a && a <= '9'
RHS:
isDigit a
|
Warning |
| Use isOctDigit |
LHS:
a >= '0' && a <= '7'
RHS:
isOctDigit a
|
Warning |
| Use isOctDigit |
LHS:
'0' <= a && a <= '7'
RHS:
isOctDigit a
|
Warning |
| Use isAlpha |
LHS:
isLower a || isUpper a
RHS:
isAlpha a
|
Warning |
| Use isAlpha |
LHS:
isUpper a || isLower a
RHS:
isAlpha a
|
Warning |
| Redundant == |
LHS:
x == True
RHS:
x
|
Warning |
| Redundant == |
LHS:
x == False
RHS:
not x
|
Suggestion |
| Redundant == |
LHS:
True == a
RHS:
a
|
Warning |
| Redundant == |
LHS:
False == a
RHS:
not a
|
Suggestion |
| Redundant == |
LHS:
(== True)
RHS:
id
|
Suggestion |
| Redundant == |
LHS:
(== False)
RHS:
not
|
Suggestion |
| Redundant == |
LHS:
(True ==)
RHS:
id
|
Suggestion |
| Redundant == |
LHS:
(False ==)
RHS:
not
|
Suggestion |
| Redundant /= |
LHS:
a /= True
RHS:
not a
|
Warning |
| Redundant /= |
LHS:
a /= False
RHS:
a
|
Suggestion |
| Redundant /= |
LHS:
True /= a
RHS:
not a
|
Warning |
| Redundant /= |
LHS:
False /= a
RHS:
a
|
Suggestion |
| Redundant /= |
LHS:
(/= True)
RHS:
not
|
Suggestion |
| Redundant /= |
LHS:
(/= False)
RHS:
id
|
Suggestion |
| Redundant /= |
LHS:
(True /=)
RHS:
not
|
Suggestion |
| Redundant /= |
LHS:
(False /=)
RHS:
id
|
Suggestion |
| Redundant if |
LHS:
if a then x else x
RHS:
x
|
Warning |
| Redundant if |
LHS:
if a then True else False
RHS:
a
|
Warning |
| Redundant if |
LHS:
if a then False else True
RHS:
not a
|
Warning |
| Redundant if |
LHS:
if a then t else (if b then t else f)
RHS:
if a || b then t else f
|
Warning |
| Redundant if |
LHS:
if a then (if b then t else f) else f
RHS:
if a && b then t else f
|
Warning |
| Redundant if |
LHS:
if x then True else y
RHS:
x || y
|
Warning |
| Redundant if |
LHS:
if x then y else False
RHS:
x && y
|
Warning |
| Redundant multi-way if |
LHS:
if | b -> t | otherwise -> fRHS:
if b then t else f
|
Warning |
| Use if |
LHS:
case a of True -> t False -> fRHS:
if a then t else f
|
Suggestion |
| Use if |
LHS:
case a of False -> f True -> tRHS:
if a then t else f
|
Suggestion |
| Use if |
LHS:
case a of True -> t _ -> fRHS:
if a then t else f
|
Suggestion |
| Use if |
LHS:
case a of False -> f _ -> tRHS:
if a then t else f
|
Suggestion |
| Redundant if |
LHS:
if c then (True, x) else (False, x)
RHS:
(c, x)
|
Suggestion |
| Redundant if |
LHS:
if c then (False, x) else (True, x)
RHS:
(not c, x)
|
Suggestion |
| Use || |
LHS:
or [x, y]
RHS:
x || y
|
Suggestion |
| Use || |
LHS:
or [x, y, z]
RHS:
x || y || z
|
Suggestion |
| Use && |
LHS:
and [x, y]
RHS:
x && y
|
Suggestion |
| Use && |
LHS:
and [x, y, z]
RHS:
x && y && z
|
Suggestion |
| Redundant if |
LHS:
if x then False else y
RHS:
not x && y
|
Warning |
| Redundant if |
LHS:
if x then y else True
RHS:
not x || y
|
Warning |
| Redundant not |
LHS:
not (not x)
RHS:
x
|
Warning |
| Use second |
LHS:
id *** g
RHS:
second g
|
Warning |
| Use first |
LHS:
f *** id
RHS:
first f
|
Warning |
| Use &&& |
LHS:
zip (map f x) (map g x)
RHS:
map (f Control.Arrow.&&& g) x
|
Ignore |
| Use &&& |
LHS:
\ x -> (f x, g x)
RHS:
f Control.Arrow.&&& g
|
Ignore |
| Redundant pair |
LHS:
(fst x, snd x)
RHS:
x
|
Suggestion |
| Use second |
LHS:
bimap id g
RHS:
second g
|
Warning |
| Use first |
LHS:
bimap f id
RHS:
first f
|
Warning |
| Redundant first |
LHS:
first id
RHS:
id
|
Warning |
| Redundant second |
LHS:
second id
RHS:
id
|
Warning |
| Redundant bimap |
LHS:
bimap id id
RHS:
id
|
Warning |
| Use bimap |
LHS:
first f (second g x)
RHS:
bimap f g x
|
Warning |
| Use bimap |
LHS:
second g (first f x)
RHS:
bimap f g x
|
Warning |
| Redundant first |
LHS:
first f (first g x)
RHS:
first (f . g) x
|
Warning |
| Redundant second |
LHS:
second f (second g x)
RHS:
second (f . g) x
|
Warning |
| Redundant bimap |
LHS:
bimap f h (bimap g i x)
RHS:
bimap (f . g) (h . i) x
|
Warning |
| Redundant first |
LHS:
first f (bimap g h x)
RHS:
bimap (f . g) h x
|
Warning |
| Redundant second |
LHS:
second g (bimap f h x)
RHS:
bimap f (g . h) x
|
Warning |
| Redundant first |
LHS:
bimap f h (first g x)
RHS:
bimap (f . g) h x
|
Warning |
| Redundant second |
LHS:
bimap f g (second h x)
RHS:
bimap f (g . h) x
|
Warning |
| Use bimap |
LHS:
\ (x, y) -> (f x, g y)
RHS:
Data.Bifunctor.bimap f g
|
Suggestion |
| Use first |
LHS:
\ (x, y) -> (f x, y)
RHS:
Data.Bifunctor.first f
|
Suggestion |
| Use second |
LHS:
\ (x, y) -> (x, f y)
RHS:
Data.Bifunctor.second f
|
Suggestion |
| Use bimap |
LHS:
(f (fst x), g (snd x))
RHS:
Data.Bifunctor.bimap f g x
|
Suggestion |
| Use first |
LHS:
(f (fst x), snd x)
RHS:
Data.Bifunctor.first f x
|
Suggestion |
| Use second |
LHS:
(fst x, g (snd x))
RHS:
Data.Bifunctor.second g x
|
Suggestion |
| Functor law |
LHS:
fmap f (fmap g x)
RHS:
fmap (f . g) x
|
Warning |
| Functor law |
LHS:
f <$> (g <$> x)
RHS:
f . g <$> x
|
Warning |
| Functor law |
LHS:
x <&> g <&> f
RHS:
x <&> f . g
|
Warning |
| Functor law |
LHS:
fmap id
RHS:
id
|
Warning |
| Functor law |
LHS:
id <$> x
RHS:
x
|
Warning |
| Functor law |
LHS:
x <&> id
RHS:
x
|
Warning |
| Redundant <$> |
LHS:
f <$> g <$> x
RHS:
f . g <$> x
|
Warning |
| Use <$> |
LHS:
fmap f $ x
RHS:
f <$> x
|
Suggestion |
| Use fmap |
LHS:
\ x -> a <$> b x
RHS:
fmap a . b
|
Suggestion |
| Use fmap |
LHS:
\ x -> b x <&> a
RHS:
fmap a . b
|
Suggestion |
| Use $> |
LHS:
x *> pure y
RHS:
x Data.Functor.$> y
|
Suggestion |
| Use $> |
LHS:
x *> return y
RHS:
x Data.Functor.$> y
|
Suggestion |
| Use <$ |
LHS:
pure x <* y
RHS:
x Data.Functor.<$ y
|
Suggestion |
| Use <$ |
LHS:
return x <* y
RHS:
x Data.Functor.<$ y
|
Suggestion |
| Use <$ |
LHS:
const x <$> y
RHS:
x <$ y
|
Suggestion |
| Use <$ |
LHS:
pure x <$> y
RHS:
x <$ y
|
Suggestion |
| Use <$ |
LHS:
return x <$> y
RHS:
x <$ y
|
Suggestion |
| Use $> |
LHS:
x <&> const y
RHS:
x Data.Functor.$> y
|
Suggestion |
| Use $> |
LHS:
x <&> pure y
RHS:
x Data.Functor.$> y
|
Suggestion |
| Use $> |
LHS:
x <&> return y
RHS:
x Data.Functor.$> y
|
Suggestion |
| Using fmap on tuple |
LHS:
fmap f (x, b)
RHS:
(x, f b)
|
Warning |
| Using <$> on tuple |
LHS:
f <$> (x, b)
RHS:
(x, f b)
|
Warning |
| Using <&> on tuple |
LHS:
(x, b) <&> f
RHS:
(x, f b)
|
Warning |
| Using fmap on tuple |
LHS:
fmap f (x, y, b)
RHS:
(x, y, f b)
|
Warning |
| Using <$> on tuple |
LHS:
f <$> (x, y, b)
RHS:
(x, y, f b)
|
Warning |
| Using <&> on tuple |
LHS:
(x, y, b) <&> f
RHS:
(x, y, f b)
|
Warning |
| Use <$> |
LHS:
pure x <*> y
RHS:
x <$> y
|
Suggestion |
| Use <$> |
LHS:
return x <*> y
RHS:
x <$> y
|
Suggestion |
| Redundant <* |
LHS:
x <* pure y
RHS:
x
|
Warning |
| Redundant <* |
LHS:
x <* return y
RHS:
x
|
Warning |
| Redundant pure |
LHS:
pure x *> y
RHS:
y
|
Warning |
| Redundant return |
LHS:
return x *> y
RHS:
y
|
Warning |
| Monad law, left identity |
LHS:
pure a >>= f
RHS:
f a
|
Warning |
| Monad law, left identity |
LHS:
return a >>= f
RHS:
f a
|
Warning |
| Monad law, left identity |
LHS:
f =<< pure a
RHS:
f a
|
Warning |
| Monad law, left identity |
LHS:
f =<< return a
RHS:
f a
|
Warning |
| Monad law, right identity |
LHS:
m >>= pure
RHS:
m
|
Warning |
| Monad law, right identity |
LHS:
m >>= return
RHS:
m
|
Warning |
| Monad law, right identity |
LHS:
pure =<< m
RHS:
m
|
Warning |
| Monad law, right identity |
LHS:
return =<< m
RHS:
m
|
Warning |
| Use fmap |
LHS:
liftM
RHS:
fmap
|
Warning |
| Use fmap |
LHS:
liftA
RHS:
fmap
|
Warning |
| Use <&> |
LHS:
m >>= pure . f
RHS:
m Data.Functor.<&> f
|
Suggestion |
| Use <&> |
LHS:
m >>= return . f
RHS:
m Data.Functor.<&> f
|
Suggestion |
| Use <$> |
LHS:
pure . f =<< m
RHS:
f <$> m
|
Suggestion |
| Use <$> |
LHS:
return . f =<< m
RHS:
f <$> m
|
Suggestion |
| Redundant fmap |
LHS:
fmap f x >>= g
RHS:
x >>= g . f
|
Warning |
| Redundant <$> |
LHS:
f <$> x >>= g
RHS:
x >>= g . f
|
Warning |
| Redundant <&> |
LHS:
x Data.Functor.<&> f >>= g
RHS:
x >>= g . f
|
Warning |
| Redundant fmap |
LHS:
g =<< fmap f x
RHS:
g . f =<< x
|
Warning |
| Redundant <$> |
LHS:
g =<< f <$> x
RHS:
g . f =<< x
|
Warning |
| Redundant <&> |
LHS:
g =<< (x Data.Functor.<&> f)
RHS:
g . f =<< x
|
Warning |
| Use when |
LHS:
if x then y else pure ()
RHS:
Control.Monad.when x $ _noParen_ y
|
Warning |
| Use when |
LHS:
if x then y else return ()
RHS:
Control.Monad.when x $ _noParen_ y
|
Warning |
| Use when |
LHS:
if x then y else pure ()
RHS:
Control.Monad.when x y
|
Warning |
| Use when |
LHS:
if x then y else return ()
RHS:
Control.Monad.when x y
|
Warning |
| Use unless |
LHS:
if x then pure () else y
RHS:
Control.Monad.unless x $ _noParen_ y
|
Warning |
| Use unless |
LHS:
if x then return () else y
RHS:
Control.Monad.unless x $ _noParen_ y
|
Warning |
| Use unless |
LHS:
if x then pure () else y
RHS:
Control.Monad.unless x y
|
Warning |
| Use unless |
LHS:
if x then return () else y
RHS:
Control.Monad.unless x y
|
Warning |
| Use mapM |
LHS:
sequence (map f x)
RHS:
mapM f x
|
Warning |
| Use mapM_ |
LHS:
sequence_ (map f x)
RHS:
mapM_ f x
|
Warning |
| Use mapM |
LHS:
sequence (f <$> x)
RHS:
mapM f x
|
Warning |
| Use mapM |
LHS:
sequence (x <&> f)
RHS:
mapM f x
|
Warning |
| Use mapM |
LHS:
sequence (fmap f x)
RHS:
mapM f x
|
Warning |
| Use mapM_ |
LHS:
sequence_ (f <$> x)
RHS:
mapM_ f x
|
Warning |
| Use mapM_ |
LHS:
sequence_ (x <&> f)
RHS:
mapM_ f x
|
Warning |
| Use mapM_ |
LHS:
sequence_ (fmap f x)
RHS:
mapM_ f x
|
Warning |
| Use forM |
LHS:
flip mapM
RHS:
Control.Monad.forM
|
Suggestion |
| Use forM_ |
LHS:
flip mapM_
RHS:
Control.Monad.forM_
|
Suggestion |
| Use mapM |
LHS:
flip forM
RHS:
mapM
|
Suggestion |
| Use mapM_ |
LHS:
flip forM_
RHS:
mapM_
|
Suggestion |
| Use unless |
LHS:
when (not x)
RHS:
unless x
|
Warning |
| Use unless |
LHS:
when (notElem x y)
RHS:
unless (elem x y)
|
Warning |
| Use when |
LHS:
unless (not x)
RHS:
when x
|
Warning |
| Use when |
LHS:
unless (notElem x y)
RHS:
when (elem x y)
|
Warning |
| Use join |
LHS:
x >>= id
RHS:
Control.Monad.join x
|
Warning |
| Use join |
LHS:
id =<< x
RHS:
Control.Monad.join x
|
Warning |
| Use =<< |
LHS:
join (f <$> x)
RHS:
f =<< x
|
Suggestion |
| Use =<< |
LHS:
join (x <&> f)
RHS:
f =<< x
|
Suggestion |
| Use =<< |
LHS:
join (fmap f x)
RHS:
f =<< x
|
Suggestion |
| Use void |
LHS:
a >> pure ()
RHS:
Control.Monad.void a
|
Suggestion |
| Use void |
LHS:
a >> return ()
RHS:
Control.Monad.void a
|
Suggestion |
| Use void |
LHS:
fmap (const ())
RHS:
Control.Monad.void
|
Warning |
| Use void |
LHS:
const () <$> x
RHS:
Control.Monad.void x
|
Warning |
| Use void |
LHS:
x <&> const ()
RHS:
Control.Monad.void x
|
Warning |
| Use void |
LHS:
() <$ x
RHS:
Control.Monad.void x
|
Warning |
| Use <=< |
LHS:
flip (>=>)
RHS:
(<=<)
|
Warning |
| Use >=> |
LHS:
flip (<=<)
RHS:
(>=>)
|
Warning |
| Use =<< |
LHS:
flip (>>=)
RHS:
(=<<)
|
Warning |
| Use >>= |
LHS:
flip (=<<)
RHS:
(>>=)
|
Warning |
| Use >=> |
LHS:
\ x -> f x >>= g
RHS:
f Control.Monad.>=> g
|
Suggestion |
| Use <=< |
LHS:
\ x -> f =<< g x
RHS:
f Control.Monad.<=< g
|
Suggestion |
| Use <=< |
LHS:
(>>= f) . g
RHS:
f Control.Monad.<=< g
|
Suggestion |
| Use <=< |
LHS:
(f =<<) . g
RHS:
f Control.Monad.<=< g
|
Suggestion |
| Redundant >> |
LHS:
a >> forever a
RHS:
forever a
|
Warning |
| Use ap |
LHS:
liftM2 id
RHS:
ap
|
Suggestion |
| Use fmap |
LHS:
liftM2 f (pure x)
RHS:
fmap (f x)
|
Warning |
| Use fmap |
LHS:
liftA2 f (return x)
RHS:
fmap (f x)
|
Warning |
| Use fmap |
LHS:
liftM2 f (pure x)
RHS:
fmap (f x)
|
Warning |
| Use fmap |
LHS:
liftM2 f (return x)
RHS:
fmap (f x)
|
Warning |
| Redundant fmap |
LHS:
fmap f (pure x)
RHS:
pure (f x)
|
Warning |
| Redundant fmap |
LHS:
fmap f (return x)
RHS:
return (f x)
|
Warning |
| Redundant <$> |
LHS:
f <$> pure x
RHS:
pure (f x)
|
Warning |
| Redundant <&> |
LHS:
pure x <&> f
RHS:
pure (f x)
|
Warning |
| Redundant <$> |
LHS:
f <$> return x
RHS:
return (f x)
|
Warning |
| Redundant <&> |
LHS:
return x <&> f
RHS:
return (f x)
|
Warning |
| Use zipWithM |
LHS:
mapM (uncurry f) (zip l m)
RHS:
zipWithM f l m
|
Warning |
| Redundant void |
LHS:
mapM_ (void . f)
RHS:
mapM_ f
|
Warning |
| Redundant void |
LHS:
forM_ x (void . f)
RHS:
forM_ x f
|
Warning |
| Use >> |
LHS:
a >>= \ _ -> b
RHS:
a >> b
|
Warning |
| Redundant <* |
LHS:
m <* pure x
RHS:
m
|
Warning |
| Redundant <* |
LHS:
m <* return x
RHS:
m
|
Warning |
| Redundant pure |
LHS:
pure x *> m
RHS:
m
|
Warning |
| Redundant return |
LHS:
return x *> m
RHS:
m
|
Warning |
| Redundant pure |
LHS:
pure x >> m
RHS:
m
|
Warning |
| Redundant return |
LHS:
return x >> m
RHS:
m
|
Warning |
| Use replicateM |
LHS:
forM [1 .. n] (const f)
RHS:
replicateM n f
|
Warning |
| Use replicateM |
LHS:
for [1 .. n] (const f)
RHS:
replicateM n f
|
Warning |
| Use replicateM |
LHS:
forM [1 .. n] (\ _ -> x)
RHS:
replicateM n x
|
Warning |
| Use replicateM |
LHS:
for [1 .. n] (\ _ -> x)
RHS:
replicateM n x
|
Warning |
| Use evalState |
LHS:
fst (runState x y)
RHS:
evalState x y
|
Warning |
| Use execState |
LHS:
snd (runState x y)
RHS:
execState x y
|
Warning |
| Use mapAndUnzipM |
LHS:
unzip <$> mapM f x
RHS:
Control.Monad.mapAndUnzipM f x
|
Warning |
| Use mapAndUnzipM |
LHS:
mapM f x <&> unzip
RHS:
Control.Monad.mapAndUnzipM f x
|
Warning |
| Use mapAndUnzipM |
LHS:
fmap unzip (mapM f x)
RHS:
Control.Monad.mapAndUnzipM f x
|
Warning |
| Use zipWithM |
LHS:
sequence (zipWith f x y)
RHS:
Control.Monad.zipWithM f x y
|
Warning |
| Use zipWithM_ |
LHS:
sequence_ (zipWith f x y)
RHS:
Control.Monad.zipWithM_ f x y
|
Warning |
| Use replicateM |
LHS:
sequence (replicate n x)
RHS:
Control.Monad.replicateM n x
|
Warning |
| Use replicateM_ |
LHS:
sequence_ (replicate n x)
RHS:
Control.Monad.replicateM_ n x
|
Warning |
| Use zipWithM |
LHS:
sequenceA (zipWith f x y)
RHS:
Control.Monad.zipWithM f x y
|
Warning |
| Use zipWithM_ |
LHS:
sequenceA_ (zipWith f x y)
RHS:
Control.Monad.zipWithM_ f x y
|
Warning |
| Use replicateM |
LHS:
sequenceA (replicate n x)
RHS:
Control.Monad.replicateM n x
|
Warning |
| Use replicateM_ |
LHS:
sequenceA_ (replicate n x)
RHS:
Control.Monad.replicateM_ n x
|
Warning |
| Use replicateM |
LHS:
mapM f (replicate n x)
RHS:
Control.Monad.replicateM n (f x)
|
Warning |
| Use replicateM_ |
LHS:
mapM_ f (replicate n x)
RHS:
Control.Monad.replicateM_ n (f x)
|
Warning |
| Fuse mapM/map |
LHS:
mapM f (map g x)
RHS:
mapM (f . g) x
|
Warning |
| Fuse mapM_/map |
LHS:
mapM_ f (map g x)
RHS:
mapM_ (f . g) x
|
Warning |
| Fuse traverse/map |
LHS:
traverse f (map g x)
RHS:
traverse (f . g) x
|
Warning |
| Fuse traverse_/map |
LHS:
traverse_ f (map g x)
RHS:
traverse_ (f . g) x
|
Warning |
| Use sequence |
LHS:
mapM id
RHS:
sequence
|
Warning |
| Use sequence_ |
LHS:
mapM_ id
RHS:
sequence_
|
Warning |
| Use for |
LHS:
flip traverse
RHS:
for
|
Warning |
| Use traverse |
LHS:
flip for
RHS:
traverse
|
Warning |
| Use for_ |
LHS:
flip traverse_
RHS:
for_
|
Warning |
| Use traverse_ |
LHS:
flip for_
RHS:
traverse_
|
Warning |
| Use sequenceA_ |
LHS:
foldr (*>) (pure ())
RHS:
sequenceA_
|
Warning |
| Use sequence_ |
LHS:
foldr (*>) (return ())
RHS:
sequence_
|
Warning |
| Use asum |
LHS:
foldr (<|>) empty
RHS:
asum
|
Warning |
| Use <**> |
LHS:
liftA2 (flip ($))
RHS:
(<**>)
|
Warning |
| Use fmap |
LHS:
liftA2 f (pure x)
RHS:
fmap (f x)
|
Warning |
| Use fmap |
LHS:
liftA2 f (return x)
RHS:
fmap (f x)
|
Warning |
| Use optional |
LHS:
Just <$> a <|> pure Nothing
RHS:
optional a
|
Warning |
| Use optional |
LHS:
Just <$> a <|> return Nothing
RHS:
optional a
|
Warning |
| Alternative law, left identity |
LHS:
empty <|> x
RHS:
x
|
Warning |
| Alternative law, right identity |
LHS:
x <|> empty
RHS:
x
|
Warning |
| Use sequenceA |
LHS:
traverse id
RHS:
sequenceA
|
Warning |
| Use sequenceA_ |
LHS:
traverse_ id
RHS:
sequenceA_
|
Warning |
| Use list comprehension |
LHS:
if b then [x] else []
RHS:
[x | b]
|
Suggestion |
| Use list comprehension |
LHS:
if b then [] else [x]
RHS:
[x | not b]
|
Suggestion |
| Redundant list comprehension |
LHS:
[x | x <- y]
RHS:
y
|
Suggestion |
| Redundant list comprehension |
LHS:
[f x | x <- [y]]
RHS:
[f y]
|
Suggestion |
| Redundant seq |
LHS:
seq x x
RHS:
x
|
Warning |
| Redundant seq |
LHS:
join seq
RHS:
id
|
Warning |
| Redundant $! |
LHS:
id $! x
RHS:
x
|
Warning |
| Redundant seq |
LHS:
seq x y
RHS:
y
|
Warning |
| Redundant $! |
LHS:
f $! x
RHS:
f x
|
Warning |
| Redundant evaluate |
LHS:
evaluate x
RHS:
return x
|
Warning |
| Redundant seq |
LHS:
seq (rnf x) ()
RHS:
rnf x
|
Warning |
| Use map |
LHS:
fst (unzip x)
RHS:
map fst x
|
Warning |
| Use map |
LHS:
snd (unzip x)
RHS:
map snd x
|
Warning |
| Use (,) |
LHS:
\ x y -> (x, y)
RHS:
(,)
|
Suggestion |
| Use (,,) |
LHS:
\ x y z -> (x, y, z)
RHS:
(,,)
|
Suggestion |
| Evaluate |
LHS:
(, b) a
RHS:
(a, b)
|
Suggestion |
| Evaluate |
LHS:
(a,) b
RHS:
(a, b)
|
Suggestion |
| Avoid NonEmpty.unzip |
LHS:
Data.List.NonEmpty.unzip
RHS:
Data.Functor.unzip
|
Warning |
| Use fromMaybe |
LHS:
maybe x id
RHS:
Data.Maybe.fromMaybe x
|
Warning |
| Redundant maybe |
LHS:
maybe Nothing Just
RHS:
id
|
Warning |
| Use isJust |
LHS:
maybe False (const True)
RHS:
Data.Maybe.isJust
|
Warning |
| Use isNothing |
LHS:
maybe True (const False)
RHS:
Data.Maybe.isNothing
|
Warning |
| Use Just |
LHS:
maybe False (x ==)
RHS:
(Just x ==)
|
Warning |
| Use Just |
LHS:
maybe True (x /=)
RHS:
(Just x /=)
|
Warning |
| Use Just |
LHS:
maybe False (== x)
RHS:
(Just x ==)
|
Warning |
| Use Just |
LHS:
maybe True (/= x)
RHS:
(Just x /=)
|
Warning |
| Use Just |
LHS:
fromMaybe False x
RHS:
Just True == x
|
Ignore |
| Use Just |
LHS:
fromMaybe True x
RHS:
Just False /= x
|
Ignore |
| Use isJust |
LHS:
not (isNothing x)
RHS:
isJust x
|
Warning |
| Use isNothing |
LHS:
not (isJust x)
RHS:
isNothing x
|
Warning |
| Use maybeToList |
LHS:
maybe [] (: [])
RHS:
maybeToList
|
Warning |
| Use mapMaybe |
LHS:
catMaybes (map f x)
RHS:
mapMaybe f x
|
Warning |
| Use mapMaybe |
LHS:
catMaybes (f <$> x)
RHS:
mapMaybe f x
|
Warning |
| Use mapMaybe |
LHS:
catMaybes (x <&> f)
RHS:
mapMaybe f x
|
Warning |
| Use mapMaybe |
LHS:
catMaybes (fmap f x)
RHS:
mapMaybe f x
|
Warning |
| Replace case with fromMaybe |
LHS:
case x of Nothing -> y Just a -> aRHS:
Data.Maybe.fromMaybe y x
|
Suggestion |
| Replace case with fromMaybe |
LHS:
case x of Just a -> a Nothing -> yRHS:
Data.Maybe.fromMaybe y x
|
Suggestion |
| Replace case with maybe |
LHS:
case x of Nothing -> y Just a -> f aRHS:
maybe y f x
|
Suggestion |
| Replace case with maybe |
LHS:
case x of Just a -> f a Nothing -> yRHS:
maybe y f x
|
Suggestion |
| Use maybe |
LHS:
if isNothing x then y else f (fromJust x)
RHS:
maybe y f x
|
Warning |
| Use maybe |
LHS:
if isJust x then f (fromJust x) else y
RHS:
maybe y f x
|
Warning |
| Use fmap |
LHS:
maybe Nothing (Just . f)
RHS:
fmap f
|
Warning |
| Use catMaybes |
LHS:
map fromJust (filter isJust x)
RHS:
Data.Maybe.catMaybes x
|
Suggestion |
| Use mapMaybe |
LHS:
filter isJust (map f x)
RHS:
map Just (mapMaybe f x)
|
Suggestion |
| Use mapMaybe |
LHS:
filter isJust (f <*> x)
RHS:
map Just (mapMaybe f x)
|
Suggestion |
| Use mapMaybe |
LHS:
filter isJust (x <&> f)
RHS:
map Just (mapMaybe f x)
|
Suggestion |
| Use mapMaybe |
LHS:
filter isJust (fmap f x)
RHS:
map Just (mapMaybe f x)
|
Suggestion |
| Use isNothing |
LHS:
x == Nothing
RHS:
isNothing x
|
Warning |
| Use isNothing |
LHS:
Nothing == x
RHS:
isNothing x
|
Warning |
| Use isJust |
LHS:
x /= Nothing
RHS:
Data.Maybe.isJust x
|
Warning |
| Use isJust |
LHS:
Nothing /= x
RHS:
Data.Maybe.isJust x
|
Warning |
| Use mapMaybe |
LHS:
concatMap (maybeToList . f)
RHS:
Data.Maybe.mapMaybe f
|
Warning |
| Use catMaybes |
LHS:
concatMap maybeToList
RHS:
catMaybes
|
Warning |
| Use <|> |
LHS:
maybe n Just x
RHS:
x Control.Applicative.<|> n
|
Warning |
| Use fromMaybe |
LHS:
if isNothing x then y else fromJust x
RHS:
fromMaybe y x
|
Warning |
| Use fromMaybe |
LHS:
if isJust x then fromJust x else y
RHS:
fromMaybe y x
|
Warning |
| Use Just |
LHS:
isJust x && (fromJust x == y)
RHS:
x == Just y
|
Warning |
| Use Just |
LHS:
isJust y && (x == fromJust y)
RHS:
Just x == y
|
Warning |
| Fuse mapMaybe/map |
LHS:
mapMaybe f (map g x)
RHS:
mapMaybe (f . g) x
|
Warning |
| Use maybe |
LHS:
fromMaybe a (fmap f x)
RHS:
maybe a f x
|
Warning |
| Use maybe |
LHS:
fromMaybe a (f <$> x)
RHS:
maybe a f x
|
Warning |
| Use maybe |
LHS:
fromMaybe a (x <&> f)
RHS:
maybe a f x
|
Warning |
| Use catMaybes |
LHS:
mapMaybe id
RHS:
catMaybes
|
Warning |
| Use catMaybes |
LHS:
[x | Just x <- a]
RHS:
Data.Maybe.catMaybes a
|
Suggestion |
| Use join |
LHS:
case m of Nothing -> Nothing Just x -> xRHS:
Control.Monad.join m
|
Suggestion |
| Use join |
LHS:
maybe Nothing id
RHS:
join
|
Suggestion |
| Use =<< |
LHS:
maybe Nothing f x
RHS:
f =<< x
|
Suggestion |
| Redundant <$> |
LHS:
maybe x f (g <$> y)
RHS:
maybe x (f . g) y
|
Warning |
| Redundant <&> |
LHS:
maybe x f (y <&> g)
RHS:
maybe x (f . g) y
|
Warning |
| Redundant fmap |
LHS:
maybe x f (fmap g y)
RHS:
maybe x (f . g) y
|
Warning |
| Redundant <$> |
LHS:
isJust (f <$> x)
RHS:
isJust x
|
Warning |
| Redundant <&> |
LHS:
isJust (x <&> f)
RHS:
isJust x
|
Warning |
| Redundant fmap |
LHS:
isJust (fmap f x)
RHS:
isJust x
|
Warning |
| Redundant <$> |
LHS:
isNothing (f <$> x)
RHS:
isNothing x
|
Warning |
| Redundant <&> |
LHS:
isNothing (x <&> f)
RHS:
isNothing x
|
Warning |
| Redundant fmap |
LHS:
isNothing (fmap f x)
RHS:
isNothing x
|
Warning |
| Redundant <$> |
LHS:
fromJust (f <$> x)
RHS:
f (fromJust x)
|
Warning |
| Redundant <&> |
LHS:
fromJust (x <&> f)
RHS:
f (fromJust x)
|
Warning |
| Redundant fmap |
LHS:
fromJust (fmap f x)
RHS:
f (fromJust x)
|
Warning |
| Redundant <$> |
LHS:
mapMaybe f (g <$> x)
RHS:
mapMaybe (f . g) x
|
Warning |
| Redundant <&> |
LHS:
mapMaybe f (x <&> g)
RHS:
mapMaybe (f . g) x
|
Warning |
| Redundant fmap |
LHS:
mapMaybe f (fmap g x)
RHS:
mapMaybe (f . g) x
|
Warning |
| Move nub out |
LHS:
catMaybes (nub x)
RHS:
nub (catMaybes x)
|
Warning |
| Move nub out |
LHS:
lefts (nub x)
RHS:
nub (lefts x)
|
Warning |
| Move nub out |
LHS:
rights (nub x)
RHS:
nub (rights x)
|
Warning |
| Move reverse out |
LHS:
catMaybes (reverse x)
RHS:
reverse (catMaybes x)
|
Warning |
| Move reverse out |
LHS:
lefts (reverse x)
RHS:
reverse (lefts x)
|
Warning |
| Move reverse out |
LHS:
rights (reverse x)
RHS:
reverse (rights x)
|
Warning |
| Move sort out |
LHS:
catMaybes (sort x)
RHS:
sort (catMaybes x)
|
Warning |
| Move sort out |
LHS:
lefts (sort x)
RHS:
sort (lefts x)
|
Warning |
| Move sort out |
LHS:
rights (sort x)
RHS:
sort (rights x)
|
Warning |
| Move nubOrd out |
LHS:
catMaybes (nubOrd x)
RHS:
nubOrd (catMaybes x)
|
Warning |
| Move nubOrd out |
LHS:
lefts (nubOrd x)
RHS:
nubOrd (lefts x)
|
Warning |
| Move nubOrd out |
LHS:
rights (nubOrd x)
RHS:
nubOrd (rights x)
|
Warning |
| Move reverse out |
LHS:
filter f (reverse x)
RHS:
reverse (filter f x)
|
Warning |
| Use lefts |
LHS:
[a | Left a <- b]
RHS:
lefts b
|
Warning |
| Use rights |
LHS:
[a | Right a <- b]
RHS:
rights b
|
Warning |
| Use fmap |
LHS:
either Left (Right . f)
RHS:
fmap f
|
Warning |
| Redundant fmap |
LHS:
either f g (fmap h x)
RHS:
either f (g . h) x
|
Warning |
| Redundant <$> |
LHS:
either f g (h <$> x)
RHS:
either f (g . h) x
|
Warning |
| Redundant <&> |
LHS:
either f g (x <&> h)
RHS:
either f (g . h) x
|
Warning |
| Redundant fmap |
LHS:
isLeft (fmap f x)
RHS:
isLeft x
|
Warning |
| Redundant <$> |
LHS:
isLeft (f <$> x)
RHS:
isLeft x
|
Warning |
| Redundant <&> |
LHS:
isLeft (x <&> f)
RHS:
isLeft x
|
Warning |
| Redundant fmap |
LHS:
isRight (fmap f x)
RHS:
isRight x
|
Warning |
| Redundant <$> |
LHS:
isRight (f <$> x)
RHS:
isRight x
|
Warning |
| Redundant <&> |
LHS:
isRight (x <&> f)
RHS:
isRight x
|
Warning |
| Redundant fmap |
LHS:
fromLeft x (fmap f y)
RHS:
fromLeft x y
|
Warning |
| Redundant <$> |
LHS:
fromLeft x (f <$> y)
RHS:
fromLeft x y
|
Warning |
| Redundant <&> |
LHS:
fromLeft x (y <&> f)
RHS:
fromLeft x y
|
Warning |
| Use either |
LHS:
fromRight x (fmap f y)
RHS:
either (const x) f y
|
Warning |
| Use either |
LHS:
fromRight x (f <$> y)
RHS:
either (const x) f y
|
Warning |
| Use either |
LHS:
fromRight x (y <&> f)
RHS:
either (const x) f y
|
Warning |
| Use fromRight |
LHS:
either (const x) id
RHS:
fromRight x
|
Warning |
| Use fromLeft |
LHS:
either id (const x)
RHS:
fromLeft x
|
Warning |
| Use =<< |
LHS:
either Left f x
RHS:
f =<< x
|
Warning |
| Use infix |
LHS:
elem x y
RHS:
x `elem` y
|
Suggestion |
| Use infix |
LHS:
notElem x y
RHS:
x `notElem` y
|
Suggestion |
| Use infix |
LHS:
isInfixOf x y
RHS:
x `isInfixOf` y
|
Suggestion |
| Use infix |
LHS:
isSuffixOf x y
RHS:
x `isSuffixOf` y
|
Suggestion |
| Use infix |
LHS:
isPrefixOf x y
RHS:
x `isPrefixOf` y
|
Suggestion |
| Use infix |
LHS:
union x y
RHS:
x `union` y
|
Suggestion |
| Use infix |
LHS:
intersect x y
RHS:
x `intersect` y
|
Suggestion |
| Redundant fromIntegral |
LHS:
fromIntegral x
RHS:
x
|
Warning |
| Redundant fromInteger |
LHS:
fromInteger x
RHS:
x
|
Warning |
| Use - |
LHS:
x + negate y
RHS:
x - y
|
Suggestion |
| Use negate |
LHS:
0 - x
RHS:
negate x
|
Suggestion |
| Redundant negate |
LHS:
negate (negate x)
RHS:
x
|
Warning |
| Use logBase |
LHS:
log y / log x
RHS:
logBase x y
|
Suggestion |
| Use tan |
LHS:
sin x / cos x
RHS:
tan x
|
Suggestion |
| Use even |
LHS:
rem n 2 == 0
RHS:
even n
|
Suggestion |
| Use even |
LHS:
0 == rem n 2
RHS:
even n
|
Suggestion |
| Use odd |
LHS:
rem n 2 /= 0
RHS:
odd n
|
Suggestion |
| Use odd |
LHS:
0 /= rem n 2
RHS:
odd n
|
Suggestion |
| Use even |
LHS:
mod n 2 == 0
RHS:
even n
|
Suggestion |
| Use even |
LHS:
0 == mod n 2
RHS:
even n
|
Suggestion |
| Use odd |
LHS:
mod n 2 /= 0
RHS:
odd n
|
Suggestion |
| Use odd |
LHS:
0 /= mod n 2
RHS:
odd n
|
Suggestion |
| Use odd |
LHS:
not (even x)
RHS:
odd x
|
Suggestion |
| Use even |
LHS:
not (odd x)
RHS:
even x
|
Suggestion |
| Use sqrt |
LHS:
x ** 0.5
RHS:
sqrt x
|
Suggestion |
| Use 1 |
LHS:
x ^ 0
RHS:
1
|
Suggestion |
| Use floor |
LHS:
round (x - 0.5)
RHS:
floor x
|
Suggestion |
| Use writeList2Chan |
LHS:
mapM_ (writeChan a)
RHS:
writeList2Chan a
|
Suggestion |
| Use readTVarIO |
LHS:
atomically (readTVar x)
RHS:
readTVarIO x
|
Warning |
| Use newTVarIO |
LHS:
atomically (newTVar x)
RHS:
newTVarIO x
|
Warning |
| Use newTMVarIO |
LHS:
atomically (newTMVar x)
RHS:
newTMVarIO x
|
Warning |
| Use newEmptyTMVarIO |
LHS:
atomically newEmptyTMVar
RHS:
newEmptyTMVarIO
|
Warning |
| Use typeRep |
LHS:
typeOf (a :: b)
RHS:
typeRep (Proxy :: Proxy b)
|
Suggestion |
| Use handle |
LHS:
flip Control.Exception.catch
RHS:
handle
|
Suggestion |
| Use catch |
LHS:
flip handle
RHS:
Control.Exception.catch
|
Suggestion |
| Use handleJust |
LHS:
flip (catchJust p)
RHS:
handleJust p
|
Suggestion |
| Use catchJust |
LHS:
flip (handleJust p)
RHS:
catchJust p
|
Suggestion |
| Use bracket_ |
LHS:
Control.Exception.bracket b (const a) (const t)
RHS:
Control.Exception.bracket_ b a t
|
Suggestion |
| Use withFile |
LHS:
Control.Exception.bracket (openFile x y) hClose
RHS:
withFile x y
|
Suggestion |
| Use withBinaryFile |
LHS:
Control.Exception.bracket (openBinaryFile x y) hClose
RHS:
withBinaryFile x y
|
Suggestion |
| Use error |
LHS:
throw (ErrorCall a)
RHS:
error a
|
Suggestion |
| Use nonTermination |
LHS:
toException NonTermination
RHS:
nonTermination
|
Warning |
| Use nestedAtomically |
LHS:
toException NestedAtomically
RHS:
nestedAtomically
|
Warning |
| Use writeIORef |
LHS:
modifyIORef r (const x)
RHS:
writeIORef r x
|
Suggestion |
| Use writeIORef |
LHS:
modifyIORef r (\ v -> x)
RHS:
writeIORef r x
|
Suggestion |
| Redundant castPtr |
LHS:
castPtr nullPtr
RHS:
nullPtr
|
Suggestion |
| Redundant castPtr |
LHS:
castPtr (castPtr x)
RHS:
castPtr x
|
Suggestion |
| Redundant castPtr |
LHS:
plusPtr (castPtr x)
RHS:
plusPtr x
|
Suggestion |
| Redundant castPtr |
LHS:
minusPtr (castPtr x)
RHS:
minusPtr x
|
Suggestion |
| Redundant castPtr |
LHS:
minusPtr x (castPtr y)
RHS:
minusPtr x y
|
Suggestion |
| Redundant castPtr |
LHS:
peekByteOff (castPtr x)
RHS:
peekByteOff x
|
Suggestion |
| Redundant castPtr |
LHS:
pokeByteOff (castPtr x)
RHS:
pokeByteOff x
|
Suggestion |
| Use mkWeakPtr |
LHS:
mkWeak a a b
RHS:
mkWeakPtr a b
|
Warning |
| Use mkWeakPair |
LHS:
mkWeak a (a, b) c
RHS:
mkWeakPair a b c
|
Warning |
| Use for_ |
LHS:
case m of Nothing -> pure () Just x -> f xRHS:
Data.Foldable.for_ m f
|
Warning |
| Use forM_ |
LHS:
case m of Nothing -> return () Just x -> f xRHS:
Data.Foldable.forM_ m f
|
Warning |
| Use for_ |
LHS:
case m of Just x -> f x Nothing -> pure ()RHS:
Data.Foldable.for_ m f
|
Warning |
| Use forM_ |
LHS:
case m of Just x -> f x Nothing -> return ()RHS:
Data.Foldable.forM_ m f
|
Warning |
| Use for_ |
LHS:
case m of Just x -> f x _ -> pure ()RHS:
Data.Foldable.for_ m f
|
Warning |
| Use forM_ |
LHS:
case m of Just x -> f x _ -> return ()RHS:
Data.Foldable.forM_ m f
|
Warning |
| Use for_ |
LHS:
when (isJust m) (f (fromJust m))
RHS:
Data.Foldable.for_ m f
|
Warning |
| Fuse concatMap/fmap |
LHS:
concatMap f (fmap g x)
RHS:
concatMap (f . g) x
|
Suggestion |
| Fuse concatMap/<$> |
LHS:
concatMap f (g <$> x)
RHS:
concatMap (f . g) x
|
Suggestion |
| Fuse concatMap/<&> |
LHS:
concatMap f (x <&> g)
RHS:
concatMap (f . g) x
|
Suggestion |
| Use all |
LHS:
null (concatMap f x)
RHS:
all (null . f) x
|
Warning |
| Use any |
LHS:
or (concat x)
RHS:
any or x
|
Warning |
| Use any |
LHS:
or (concatMap f x)
RHS:
any (or . f) x
|
Warning |
| Use all |
LHS:
and (concat x)
RHS:
all and x
|
Warning |
| Use all |
LHS:
and (concatMap f x)
RHS:
all (and . f) x
|
Warning |
| Use any |
LHS:
any f (concat x)
RHS:
any (any f) x
|
Warning |
| Use any |
LHS:
any f (concatMap g x)
RHS:
any (any f . g) x
|
Warning |
| Use all |
LHS:
all f (concat x)
RHS:
all (all f) x
|
Warning |
| Use all |
LHS:
all f (concatMap g x)
RHS:
all (all f . g) x
|
Warning |
| Use foldMap |
LHS:
fold (concatMap f x)
RHS:
foldMap (fold . f) x
|
Warning |
| Use foldMap |
LHS:
foldMap f (concatMap g x)
RHS:
foldMap (foldMap f . g) x
|
Warning |
| Move catMaybes |
LHS:
catMaybes (concatMap f x)
RHS:
concatMap (catMaybes . f) x
|
Warning |
| Move catMaybes |
LHS:
catMaybes (concat x)
RHS:
concatMap catMaybes x
|
Warning |
| Move filter |
LHS:
filter f (concatMap g x)
RHS:
concatMap (filter f . g) x
|
Suggestion |
| Move filter |
LHS:
filter f (concat x)
RHS:
concatMap (filter f) x
|
Suggestion |
| Move mapMaybe |
LHS:
mapMaybe f (concatMap g x)
RHS:
concatMap (mapMaybe f . g) x
|
Warning |
| Move mapMaybe |
LHS:
mapMaybe f (concat x)
RHS:
concatMap (mapMaybe f) x
|
Warning |
| Use any |
LHS:
or (fmap p x)
RHS:
any p x
|
Warning |
| Use any |
LHS:
or (p <$> x)
RHS:
any p x
|
Warning |
| Use any |
LHS:
or (x <&> p)
RHS:
any p x
|
Warning |
| Use all |
LHS:
and (fmap p x)
RHS:
all p x
|
Warning |
| Use all |
LHS:
and (p <$> x)
RHS:
all p x
|
Warning |
| Use all |
LHS:
and (x <&> p)
RHS:
all p x
|
Warning |
| Redundant fmap |
LHS:
any f (fmap g x)
RHS:
any (f . g) x
|
Warning |
| Redundant <$> |
LHS:
any f (g <$> x)
RHS:
any (f . g) x
|
Warning |
| Redundant <&> |
LHS:
any f (x <&> g)
RHS:
any (f . g) x
|
Warning |
| Redundant fmap |
LHS:
all f (fmap g x)
RHS:
all (f . g) x
|
Warning |
| Redundant <$> |
LHS:
all f (g <$> x)
RHS:
all (f . g) x
|
Warning |
| Redundant <&> |
LHS:
all f (x <&> g)
RHS:
all (f . g) x
|
Warning |
| Fuse foldr/fmap |
LHS:
foldr f z (fmap g x)
RHS:
foldr (f . g) z x
|
Suggestion |
| Fuse foldr/<$> |
LHS:
foldr f z (g <$> x)
RHS:
foldr (f . g) z x
|
Suggestion |
| Fuse foldr/<&> |
LHS:
foldr f z (x <&> g)
RHS:
foldr (f . g) z x
|
Suggestion |
| Use gets |
LHS:
f <$> Control.Monad.State.get
RHS:
gets f
|
Warning |
| Use gets |
LHS:
Control.Monad.State.get <&> f
RHS:
gets f
|
Warning |
| Use gets |
LHS:
fmap f Control.Monad.State.get
RHS:
gets f
|
Warning |
| Redundant <$> |
LHS:
f <$> Control.Monad.State.gets g
RHS:
gets (f . g)
|
Warning |
| Redundant <&> |
LHS:
Control.Monad.State.gets g <&> f
RHS:
gets (f . g)
|
Warning |
| Redundant fmap |
LHS:
fmap f (Control.Monad.State.gets g)
RHS:
gets (f . g)
|
Warning |
| Use asks |
LHS:
f <$> Control.Monad.Reader.ask
RHS:
asks f
|
Warning |
| Use asks |
LHS:
Control.Monad.Reader.ask <&> f
RHS:
asks f
|
Warning |
| Use asks |
LHS:
fmap f Control.Monad.Reader.ask
RHS:
asks f
|
Warning |
| Redundant <$> |
LHS:
f <$> Control.Monad.Reader.asks g
RHS:
asks (f . g)
|
Warning |
| Redundant <&> |
LHS:
Control.Monad.Reader.asks g <&> f
RHS:
asks (f . g)
|
Warning |
| Redundant fmap |
LHS:
fmap f (Control.Monad.Reader.asks g)
RHS:
asks (f . g)
|
Warning |
| Use evalState |
LHS:
fst (runState m s)
RHS:
evalState m s
|
Warning |
| Use execState |
LHS:
snd (runState m s)
RHS:
execState m s
|
Warning |
| Evaluate |
LHS:
True && x
RHS:
x
|
Warning |
| Evaluate |
LHS:
False && x
RHS:
False
|
Warning |
| Evaluate |
LHS:
True || x
RHS:
True
|
Warning |
| Evaluate |
LHS:
False || x
RHS:
x
|
Warning |
| Evaluate |
LHS:
not True
RHS:
False
|
Warning |
| Evaluate |
LHS:
not False
RHS:
True
|
Warning |
| Evaluate |
LHS:
Nothing >>= k
RHS:
Nothing
|
Warning |
| Evaluate |
LHS:
k =<< Nothing
RHS:
Nothing
|
Warning |
| Evaluate |
LHS:
either f g (Left x)
RHS:
f x
|
Warning |
| Evaluate |
LHS:
either f g (Right y)
RHS:
g y
|
Warning |
| Evaluate |
LHS:
fst (x, y)
RHS:
x
|
Warning |
| Evaluate |
LHS:
snd (x, y)
RHS:
y
|
Warning |
| Evaluate |
LHS:
fromJust (Just x)
RHS:
x
|
Warning |
| Evaluate |
LHS:
fromLeft y (Left x)
RHS:
x
|
Warning |
| Evaluate |
LHS:
fromLeft y (Right x)
RHS:
y
|
Warning |
| Evaluate |
LHS:
fromRight y (Right x)
RHS:
x
|
Warning |
| Evaluate |
LHS:
fromRight y (Left x)
RHS:
y
|
Warning |
| Evaluate |
LHS:
head [x]
RHS:
x
|
Warning |
| Evaluate |
LHS:
last [x]
RHS:
x
|
Warning |
| Evaluate |
LHS:
tail [x]
RHS:
[]
|
Warning |
| Evaluate |
LHS:
init [x]
RHS:
[]
|
Warning |
| Evaluate |
LHS:
null [x]
RHS:
False
|
Warning |
| Evaluate |
LHS:
null []
RHS:
True
|
Warning |
| Evaluate |
LHS:
null ""
RHS:
True
|
Warning |
| Evaluate |
LHS:
length []
RHS:
0
|
Warning |
| Evaluate |
LHS:
length ""
RHS:
0
|
Warning |
| Evaluate |
LHS:
foldl f z []
RHS:
z
|
Warning |
| Evaluate |
LHS:
foldr f z []
RHS:
z
|
Warning |
| Evaluate |
LHS:
foldr1 f [x]
RHS:
x
|
Warning |
| Evaluate |
LHS:
scanr f z []
RHS:
[z]
|
Warning |
| Evaluate |
LHS:
scanr1 f []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
scanr1 f [x]
RHS:
[x]
|
Warning |
| Evaluate |
LHS:
take n []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
take n ""
RHS:
""
|
Warning |
| Evaluate |
LHS:
drop n []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
drop n ""
RHS:
""
|
Warning |
| Evaluate |
LHS:
takeWhile p []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
takeWhile p ""
RHS:
""
|
Warning |
| Evaluate |
LHS:
dropWhile p []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
dropWhile p ""
RHS:
""
|
Warning |
| Evaluate |
LHS:
span p []
RHS:
([], [])
|
Warning |
| Evaluate |
LHS:
span p ""
RHS:
("", "")
|
Warning |
| Evaluate |
LHS:
lines ""
RHS:
[]
|
Warning |
| Evaluate |
LHS:
lines []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
unwords []
RHS:
""
|
Warning |
| Evaluate |
LHS:
x - 0
RHS:
x
|
Warning |
| Evaluate |
LHS:
x * 1
RHS:
x
|
Warning |
| Evaluate |
LHS:
x / 1
RHS:
x
|
Warning |
| Evaluate |
LHS:
concat [a]
RHS:
a
|
Warning |
| Evaluate |
LHS:
concat []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
concatMap f [a]
RHS:
f a
|
Warning |
| Evaluate |
LHS:
concatMap f []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
zip [] []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
const x y
RHS:
x
|
Warning |
| Evaluate |
LHS:
any (const False)
RHS:
const False
|
Warning |
| Evaluate |
LHS:
all (const True)
RHS:
const True
|
Warning |
| Evaluate |
LHS:
[] ++ x
RHS:
x
|
Warning |
| Evaluate |
LHS:
"" ++ x
RHS:
x
|
Warning |
| Evaluate |
LHS:
x ++ []
RHS:
x
|
Warning |
| Evaluate |
LHS:
x ++ ""
RHS:
x
|
Warning |
| Evaluate |
LHS:
all f [a]
RHS:
f a
|
Warning |
| Evaluate |
LHS:
all f []
RHS:
True
|
Warning |
| Evaluate |
LHS:
any f [a]
RHS:
f a
|
Warning |
| Evaluate |
LHS:
any f []
RHS:
False
|
Warning |
| Evaluate |
LHS:
maximum [a]
RHS:
a
|
Warning |
| Evaluate |
LHS:
minimum [a]
RHS:
a
|
Warning |
| Evaluate |
LHS:
map f []
RHS:
[]
|
Warning |
| Evaluate |
LHS:
map f [a]
RHS:
[f a]
|
Warning |
| Using foldr on tuple |
LHS:
foldr f z (x, b)
RHS:
f b z
|
Warning |
| Using foldr' on tuple |
LHS:
foldr' f z (x, b)
RHS:
f b z
|
Warning |
| Using foldl on tuple |
LHS:
foldl f z (x, b)
RHS:
f z b
|
Warning |
| Using foldl' on tuple |
LHS:
foldl' f z (x, b)
RHS:
f z b
|
Warning |
| Using foldMap on tuple |
LHS:
foldMap f (x, b)
RHS:
f b
|
Warning |
| Using foldr1 on tuple |
LHS:
foldr1 f (x, b)
RHS:
b
|
Warning |
| Using foldl1 on tuple |
LHS:
foldl1 f (x, b)
RHS:
b
|
Warning |
| Using elem on tuple |
LHS:
elem e (x, b)
RHS:
e == b
|
Warning |
| Using fold on tuple |
LHS:
fold (x, b)
RHS:
b
|
Warning |
| Using toList on tuple |
LHS:
toList (x, b)
RHS:
b
|
Warning |
| Using maximum on tuple |
LHS:
maximum (x, b)
RHS:
b
|
Warning |
| Using minimum on tuple |
LHS:
minimum (x, b)
RHS:
b
|
Warning |
| Using notElem on tuple |
LHS:
notElem e (x, b)
RHS:
e /= b
|
Warning |
| Using sum on tuple |
LHS:
sum (x, b)
RHS:
b
|
Warning |
| Using product on tuple |
LHS:
product (x, b)
RHS:
b
|
Warning |
| Using concat on tuple |
LHS:
concat (x, b)
RHS:
b
|
Warning |
| Using concatMap on tuple |
LHS:
concatMap f (x, b)
RHS:
f b
|
Warning |
| Using and on tuple |
LHS:
and (x, b)
RHS:
b
|
Warning |
| Using or on tuple |
LHS:
or (x, b)
RHS:
b
|
Warning |
| Using any on tuple |
LHS:
any f (x, b)
RHS:
f b
|
Warning |
| Using all on tuple |
LHS:
all f (x, b)
RHS:
f b
|
Warning |
| Using foldr on tuple |
LHS:
foldr f z (x, y, b)
RHS:
f b z
|
Warning |
| Using foldr' on tuple |
LHS:
foldr' f z (x, y, b)
RHS:
f b z
|
Warning |
| Using foldl on tuple |
LHS:
foldl f z (x, y, b)
RHS:
f z b
|
Warning |
| Using foldl' on tuple |
LHS:
foldl' f z (x, y, b)
RHS:
f z b
|
Warning |
| Using foldMap on tuple |
LHS:
foldMap f (x, y, b)
RHS:
f b
|
Warning |
| Using foldr1 on tuple |
LHS:
foldr1 f (x, y, b)
RHS:
b
|
Warning |
| Using foldl1 on tuple |
LHS:
foldl1 f (x, y, b)
RHS:
b
|
Warning |
| Using elem on tuple |
LHS:
elem e (x, y, b)
RHS:
e == b
|
Warning |
| Using fold on tuple |
LHS:
fold (x, y, b)
RHS:
b
|
Warning |
| Using toList on tuple |
LHS:
toList (x, y, b)
RHS:
b
|
Warning |
| Using maximum on tuple |
LHS:
maximum (x, y, b)
RHS:
b
|
Warning |
| Using minimum on tuple |
LHS:
minimum (x, y, b)
RHS:
b
|
Warning |
| Using notElem on tuple |
LHS:
notElem e (x, y, b)
RHS:
e /= b
|
Warning |
| Using sum on tuple |
LHS:
sum (x, y, b)
RHS:
b
|
Warning |
| Using product on tuple |
LHS:
product (x, y, b)
RHS:
b
|
Warning |
| Using concat on tuple |
LHS:
concat (x, y, b)
RHS:
b
|
Warning |
| Using concatMap on tuple |
LHS:
concatMap f (x, y, b)
RHS:
f b
|
Warning |
| Using and on tuple |
LHS:
and (x, y, b)
RHS:
b
|
Warning |
| Using or on tuple |
LHS:
or (x, y, b)
RHS:
b
|
Warning |
| Using any on tuple |
LHS:
any f (x, y, b)
RHS:
f b
|
Warning |
| Using all on tuple |
LHS:
all f (x, y, b)
RHS:
f b
|
Warning |
| Using null on tuple |
LHS:
null x
RHS:
False
|
Warning |
| Using length on tuple |
LHS:
length x
RHS:
1
|
Warning |
| Use empty |
LHS:
Data.Map.fromList []
RHS:
Data.Map.empty
|
Warning |
| Use empty |
LHS:
Data.Map.Lazy.fromList []
RHS:
Data.Map.Lazy.empty
|
Warning |
| Use empty |
LHS:
Data.Map.Strict.fromList []
RHS:
Data.Map.Strict.empty
|
Warning |
| Redundant ^. |
LHS:
(a ^. b) ^. c
RHS:
a ^. (b . c)
|
Warning |
| Use ^?! |
LHS:
fromJust (a ^? b)
RHS:
a ^?! b
|
Warning |
| Use ?~ |
LHS:
a .~ Just b
RHS:
a ?~ b
|
Warning |
| Use <&> |
LHS:
(mapped %~ b) a
RHS:
a <&> b
|
Warning |
| Use <&> |
LHS:
((mapped . b) %~ c) a
RHS:
a <&> b %~ c
|
Warning |
| Use <$ |
LHS:
(mapped .~ b) a
RHS:
b <$ a
|
Warning |
| Use view |
LHS:
ask <&> (^. a)
RHS:
view a
|
Warning |
| Redundant <&> |
LHS:
view a <&> (^. b)
RHS:
view (a . b)
|
Warning |
| Use ix |
LHS:
Control.Lens.at a . Control.Lens._Just
RHS:
Control.Lens.ix a
|
Warning |
| Use True |
LHS:
Control.Lens.has (Control.Lens.at a)
RHS:
True
|
Error |
| Redundant at |
LHS:
Control.Lens.has (a . Control.Lens.at b)
RHS:
Control.Lens.has a
|
Warning |
| Use False |
LHS:
Control.Lens.nullOf (Control.Lens.at a)
RHS:
False
|
Error |
| Redundant at |
LHS:
Control.Lens.nullOf (a . Control.Lens.at b)
RHS:
Control.Lens.nullOf a
|
Warning |
| Use optional |
LHS:
Data.Attoparsec.Text.option Nothing (Just <$> p)
RHS:
optional p
|
Warning |
| Use optional |
LHS:
Data.Attoparsec.ByteString.option Nothing (Just <$> p)
RHS:
optional p
|
Warning |
| Use return |
LHS:
Test.QuickCheck.choose (x, x)
RHS:
return x
|
Warning |
| Use return |
LHS:
Test.QuickCheck.chooseInt (x, x)
RHS:
return x
|
Warning |
| Use return |
LHS:
Test.QuickCheck.chooseInteger (x, x)
RHS:
return x
|
Warning |
| Use return |
LHS:
Test.QuickCheck.chooseBoundedIntegral (x, x)
RHS:
return x
|
Warning |
| Use return |
LHS:
Test.QuickCheck.chooseEnum (x, x)
RHS:
return x
|
Warning |
| Use oneof |
LHS:
Control.Monad.join (Test.QuickCheck.elements l)
RHS:
Test.QuickCheck.oneof l
|
Warning |
| Use return |
LHS:
Test.QuickCheck.elements [x]
RHS:
return x
|
Warning |
| Use return |
LHS:
Test.QuickCheck.growingElements [x]
RHS:
return x
|
Warning |
| Evaluate |
LHS:
Test.QuickCheck.oneof [x]
RHS:
x
|
Warning |
| Evaluate |
LHS:
Test.QuickCheck.frequency [(a, x)]
RHS:
x
|
Warning |