#16246: GHC HEAD-only Core Lint error with unboxed equality (Non-CoVar has coercion type) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.10.1 Component: Compiler | Version: 8.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #15648 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Hrm. Maybe we should just drop that test? The problem is that GHC may look at a type and, if it's headed by `~#`, assume that any variable of that type is a coercion variable. There's nothing wrong in the theory if an ordinary variable has type `~#`... it's just perhaps an invariant that GHC might rely on (not sure). Another possibility is to have a check in `Convert` that prevents conversion of verboten things, like `~#`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16246#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler