Proposal: Treat OtherLetter as lower case in the grammar

[Edward Kmett]

Back in 2008 or so, GHC changed the behavior of unicode characters in the
parser that parse as OtherLetter to make them parse as lower case so that
languages like Japanese that lack case could be used in identifier names:

https://ghc.haskell.org/trac/ghc/ticket/1103

In a recent thread on reddit Lennart Augustsson pointed out that this
change
was never backported to Haskell'.

http://www.reddit.com/r/haskell/comments/2dce3d/%E0%B2%A0_%E0%B2%A0_string_a/cjo68ij

Would it make sense to adopt this change in the language standard?

Marlow when he made the change to GHC noted he was considering bringing it
up to Haskell' but here we are 6 years later.

-Edward Kmett
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