Re: [GHC] #13595: Should ‘coerce’ be levity polymorphic?

[GHC]

#13595: Should ‘coerce’ be levity polymorphic?
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13592            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by andrewthad):

 Another use-case I just stumbled across is the coercion of unboxed tuple
 types:

 {{{
 coerceTuple :: (# a, (# b, c #) #) -> (# a, b, c #)
 coerceTuple = coerce
 }}}

 This does not currently work, but it would be nice if it did.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13595#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler