Selects upper-case or title-case alphabetic Unicode characters (letters). Title case is used by a small number of letter ligatures like
#14589: The isUpper function should return true for the '\9438' character -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): This is documented behavior. `isUpper` says: the single-character form of Lj. Note that is says “letter”, and the code in libraries/base/cbits/WCsubst.c explicitly selects only uppper-case and title-case letters. I see how this is a bit unfortunate, but I am sure we should not change the semantics of `isUpper` . Maybe we are missing a function? `isUpperAnything` or something? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14589#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler