Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/Char/ToLower.hs

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Distributed under the MIT License.
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module Char where

import IsUpper

toLower	:: Char -> Char
toLower c | isUpper c	=  toEnum ((fromEnum c - fromEnum 'A') + fromEnum 'a')
	  | otherwise	=  c

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