[GHC] #15775: Interpreter is treating a comment character as an identifier character.

[GHC]

#15775: Interpreter is treating a comment character as an identifier character.
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        Reporter:  philderbeast  |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  GHCi          |              Version:  8.4.3
      Resolution:                |             Keywords:  CPP
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Changes (by RyanGlScott):

 * status:  infoneeded => new


Comment:

 Indeed, I can reproduce this with `clang-cpp-6.0` on Linux:

 {{{
 $ clang-cpp-6.0 Bug.hs
 Bug.hs:4:28: warning: treating Unicode character <U+2227> as identifier
 character rather than as
       '^' symbol [-Wunicode-homoglyph]
     -- | > Combine x y ~ x ∧ y
                            ^
 # 1 "Bug.hs"
 # 1 "<built-in>" 1
 # 1 "<built-in>" 3
 # 349 "<built-in>" 3
 # 1 "<command line>" 1
 # 1 "<built-in>" 2
 # 1 "Bug.hs" 2
 {-# LANGUAGE CPP #-}

 data Expr s a
     -- | > Combine x y ~ x ∧ y
     = Combine (Expr s a) (Expr s a)
 1 warning generated.

 $ clang-cpp-6.0 --version
 clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
 Target: x86_64-pc-linux-gnu
 Thread model: posix
 InstalledDir: /usr/bin
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15775#comment:4>
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