fork download 
  1. class Foo a where
  2.    foo :: a -> a
  3.  
  4. bar :: Foo a => a -> a
  5. bar x = foo a
  6.  
  7. instance Foo Int where
  8.    foo x = x + 1
  9.  
  10. main = do
  11.    let x = 1 :: Int
  12.    print (bar x)
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:5:12: Not in scope: `a'
stdout 
Standard output is empty
https://ideone.com/MsL7HD
language:
Haskell (ghc 8.4.4)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!