[GHC] #9732: Pattern synonyms and unboxed values

[GHC]

#9732: Pattern synonyms and unboxed values
-------------------------------------+-------------------------------------
              Reporter:  monoidal    |            Owner:  cactus
                  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:              |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 * `cont` and `fail` should take an extra arg if (but only if) they have no
 other value args, and the result type is unlifted.  This is easy to test.

  * Don't give them an extra arg of `()`.  Rather use `voidPrimId`.  This
 is zero bits wide, and hence takes no instructions to pass.   Just like
 `mkWorkerArgs`.

  * Yes, it's fine to give the `r` variable an `OpenTypeKind`.  Similar to
 the `errorId` definitions in `MkId`.

 OK?

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9732#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler