[GHC] #13986: TypeApplications causes parse errors in @-patterns with certain Unicode characters

16 Jul 2017

      #13986: TypeApplications causes parse errors in @-patterns with certain Unicode
characters
-------------------------------------+-------------------------------------
           Reporter:  Tikhon         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC rejects
  Unknown/Multiple                   |  valid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The following function definition works without TypeApplications but fails
 to parse with the extension enabled:

 {{{#!hs
 {-# LANGUAGE TypeApplications #-}
 module Mininal where

 foo x₁@True = 10
 }}}

 It also parses correctly with "x" in place of "x₁".

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13986
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