Author
anonymous
over 7 years ago
Language
Haskell
Compiler
ghc 8.2.1
Options
Warnings
Author
anonymous
over 7 years ago
$ ghc prog.hs -o prog.exe -Wall [1 of 1] Compiling Main ( prog.hs, prog.o )
prog.hs:4:10: error:
• Couldn't match expected type ‘[t]’
with actual type ‘[t0] -> [t0]’
• Probable cause: ‘f’ is applied to too few arguments
In the expression: f xs
In the expression: if p x then f xs else as
In an equation for ‘f’: f p as@(x : xs) = if p x then f xs else as
• Relevant bindings include
xs :: [t] (bound at prog.hs:2:11)
x :: t (bound at prog.hs:2:9)
as :: [t] (bound at prog.hs:2:5)
p :: t -> Bool (bound at prog.hs:2:3)
f :: (t -> Bool) -> [t] -> [t] (bound at prog.hs:2:1)
|
4 | then f xs
| ^^^^
prog.hs:4:12: error:
• Couldn't match expected type ‘t0 -> Bool’ with actual type ‘[t]’
• In the first argument of ‘f’, namely ‘xs’
In the expression: f xs
In the expression: if p x then f xs else as
• Relevant bindings include
xs :: [t] (bound at prog.hs:2:11)
x :: t (bound at prog.hs:2:9)
as :: [t] (bound at prog.hs:2:5)
p :: t -> Bool (bound at prog.hs:2:3)
f :: (t -> Bool) -> [t] -> [t] (bound at prog.hs:2:1)
|
4 | then f xs
| ^^
Exit Code:
1