#14826: Flatten data types extending other data types in STG -------------------------------------+------------------------------------- Reporter: nomeata | Owner: (none) Type: feature request | Status: new Priority: low | Milestone: Component: Compiler | Version: 8.5 Resolution: | Keywords: 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 sgraf): As I understand your proposal, this will re-use info pointers. Is that right? If so, is that a requirement? I imagine we could encode something more general by lifting any data constructor consisting purely of an unboxed sum of arity n to n distinct constructor tags. That way, we can drop the 'only once' requirement. Well, I guess this still involves non-`id` coercions... Still, we could encode the 'only once' thing, where we re-use constructor tags, as a special case to get erasable coercions. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14826#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler