#15192: Refactor of Coercion -------------------------------------+------------------------------------- Reporter: ningning | Owner: (none) Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4747 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Can you elaborate? * What are the advantages of the new form? (It looks more symmetrical; but it has more arguments.) Can you say what the "several places" where is is useful are? Are there any disadvanatages? * Can we use the new form in `OptCoercion` to simplify coercions? * I see no constraints on `r` in the rule. So you could fix on `N` and use `SubCo` to downgrade to `R`? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15192#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler