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  1. class A a where
  2.   f :: a
  3.  
  4. class A a => B a where
  5.   g :: a
  6.   f = g
  7.  
  8. instance B Int where
  9.   g = 42
  10.  
  11. main = print (f :: Int)
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:6:3: `f' is not a (visible) method of class `B'
stdout
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Standard output is empty
https://ideone.com/ek0SRj
language:
Haskell (ghc 8.4.4)
created:
9 years ago
visibility:
public

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