#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 goldfire): I agree with Stephanie's first few paragraphs, but not her last one. GHC ''already'' works up to erasure-equivalence. That is, `eqType` returns `True` whenever two types are erasure-equivalent (and have the same kinds). But we still need the coherence coercions, because they sometimes change kinds. I guess that will change once we move to homogeneous equality, though... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15192#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler