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  1. main = print $ foldl (:) [] "abcd"
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:1:21:
    Occurs check: cannot construct the infinite type: a = [a]
      Expected type: a -> [a] -> a
      Inferred type: a -> [a] -> [a]
    In the first argument of `foldl', namely `(:)'
    In the second argument of `($)', namely `foldl (:) [] "abcd"'
stdout
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Standard output is empty
https://ideone.com/Ljzh7
language:
Haskell (ghc 8.4.4)
created:
14 years ago
visibility:
public

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