Re: [GHC] #14561: Panic on levity polymorphic very unsafe coerce

13 Dec 2017

      #14561: Panic on levity polymorphic very unsafe coerce
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
                                     |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones ):

 In [changeset:"321b420f4582d103ca7b304867b916a749712e9f/ghc" 321b420/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="321b420f4582d103ca7b304867b916a749712e9f"
 Tidy up of wired-in names

 Two things here:

 * While debugging Trac #14561 I found it hard to understand
   ghcPrimIds and magicIds in MkId.  This patch adds more
   structure and comments.

 * I also discovered that ($) no longer needs to be a wiredInId
   because we now have levity polymorphism.  So I took dollarId
   out of MkId; and gave it a levity-polymorphic type in GHC.Base
 }}}

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14561#comment:7
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler