#10982: Warn about unused pattern variables in type families -------------------------------------+------------------------------------- Reporter: jstolarek | Owner: msosn Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11098 | Differential Rev(s): Phab:D1576 Wiki Page: | -------------------------------------+------------------------------------- Changes (by jstolarek): * related: => #11098 Comment: This looks like a manifestation of #11098. I tried fixing it by "making renamer do its job" but got stuck because I didn't know how to tell whether a type variable was introduced using a forall or not - see [ticket:11098#comment:3]. But this was before wildcard refactor patch (Phab:D1428). Now, looking at Note [HsType binders] in HsTypes, I think it is easy to tell whether a type variable was quantified explicitly or not. Michał, does this allow you to make progress? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10982#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler