Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/Char/IsHexDigit.hs
module Char where isHexDigit :: Char -> Bool isHexDigit c = (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')
