[GHC] #11743: Add unicode support for TH quotes (`[| |]`) (was: Add unicode support for special brackets (`{| |}` and `[| |]`))

[GHC]

#11743: Add unicode support for TH quotes (`[| |]`)
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        Reporter:  JoshPrice247      |                Owner:  JoshPrice247
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
  (Parser)                           |             Keywords:  unicode,
      Resolution:                    |  UnicodeSyntax
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  2878, 10162       |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by JoshPrice247:

@@ -13,2 +13,3 @@
- Banana brackets were then suggested in #10162 and implemented in
- Phab:D2012 (which has been accepted, but has not yet landed).
+ Generic classes have since been removed and banana brackets were suggested
+ in #10162 and implemented in Phab:D2012 (which has been accepted, but has
+ not yet landed), leaving TH quotes.

New description:

 This has been mentioned before but didn't have it's own ticket.

 The following where mentioned in #2978, but the respective patch did not
 include them:

  * For TemplateHaskell: `⟦ ⟧` (MATHEMATICAL _ WHITE SQUARE BRACKET) can be
 used instead of `[| |]`
  * For Generics: `⦃ ⦄` (_ WHITE CURLY BRACKET) can be used instead of `{|
 |}`
  * For Arrows: `⦇ ⦈` (Z NOTATION _ IMAGE BRACKET) can be used instead of
 `(| |)`

 Generic classes have since been removed and banana brackets were suggested
 in #10162 and implemented in Phab:D2012 (which has been accepted, but has
 not yet landed), leaving TH quotes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11743#comment:1>
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