Discussion:
documentation bug in base
Ben Franksen
2017-10-15 19:10:20 UTC
Permalink
Data.List claims:

unlines is an inverse operation to lines.

which I understand to mean

prop> unlines (lines s) = s

which is false in general. It should say

prop> unlines (lines s) = if last s == '\n' then s else s ++ "\n"

Cheers
Ben

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