#15927: Weird interaction between fundeps and overlappable instances -------------------------------------+------------------------------------- Reporter: Darwin226 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.6.2 Resolution: | Keywords: | FunctionalDependencies Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: 10675, 15632 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Darwin226): I'm sorry if you addressed this in your comment and I'm just not getting it, but note that I'm not just declaring `f` with and unsatisfyable constraint. I'm also able to satisfy it! So writing {{{#!hs g :: StateT Int (StateT Char IO) () g = f }}} works. So are you saying that this behavior can be relied on? Is my code likely to get broken in newer GHC versions? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15927#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler