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  1. main = print  "1138"
  2.  
  3. fn :: [Char] -> a 
  4. fn list = 2 * length list
  5.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:4:15:
    Couldn't match expected type `a' with actual type `Int'
      `a' is a rigid type variable bound by
          the type signature for fn :: [Char] -> a at prog.hs:3:7
    In the return type of a call of `length'
    In the second argument of `(*)', namely `length list'
    In the expression: 2 * length list
stdout
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Standard output is empty
https://ideone.com/XaRBKt
test
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
secret

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