[GHC] #10412: isAlphaNum includes mark characters, but neither isAlpha nor isNumber do

[GHC]

#10412: isAlphaNum includes mark characters, but neither isAlpha nor isNumber do
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        Reporter:  Artyom.Kazak      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.1
      Resolution:                    |             Keywords:  unicode,
                                     |  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Azel):

 From what I can see on various C and C++ documentations (i.e.
 [https://docs.microsoft.com/en-gb/cpp/c-runtime-library/reference/isalnum-
 iswalnum-isalnum-l-iswalnum-l Microsoft's],
 [https://www.gnu.org/software/libc/manual/html_node/Classification-of-
 Wide-Characters.html#Classification-of-Wide-Characters the glibc's] or
 [http://en.cppreference.com/w/cpp/string/wide/iswalnum cppreference.com's]
 which refers us [http://www.open-std.org/JTC1/SC35/WG5/docs/30112d10.pdf
 here]) `iswalnum`'s behaviour should be to return `True` if either of
 `iswalpha` or `iswdigit` does, so I guess `isAlphaNum` ought to do the
 same. That is, keeping the documentation as it is and fixing `u_iswalnum`.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10412#comment:5>
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