[GHC] #9732: Pattern synonyms and unboxed values

[GHC]

#9732: Pattern synonyms and unboxed values
-------------------------------------+-------------------------------------
              Reporter:  monoidal    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time crash                         |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Description changed by monoidal:

Old description:

> It's possible to declare a toplevel unboxed value with a pattern synonym,
> which causes a panic:
>
> {{{
> {-# LANGUAGE PatternSynonyms, MagicHash #-}
> pattern P = 0#
> }}}
>
> (compare with error on `x = 0#`).

New description:

 It's possible to declare a toplevel unboxed value with a pattern synonym,
 which causes a panic:

 {{{
 {-# LANGUAGE PatternSynonyms, MagicHash #-}
 pattern P = 0#
 }}}

 (compare with error on `x = 0#`). `pattern P <- 0#` seems to work fine.

--

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9732#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler