#13549: GHC 8.2.1's typechecker rejects code generated by singletons that 8.0 accepts -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * priority: high => normal * milestone: 8.2.1 => 8.4.1 Comment: You are correct that adding more type signatures to the `where`-bound functions of `permutations` (specifically, `interleave'`) resolves the issue upstream in `singletons`. Given that there's a viable workaround, I'm going to reduce the priority of this ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13549#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler