#14630: name shadowing warnings by record pattern synonyms + RecordWildCards or NamedFieldPuns -------------------------------------+------------------------------------- Reporter: mizunashi_mana | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11228 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by adamgundry): * cc: mpickering (added) Comment: I agree with Ryan's analysis. Now that we have pattern synoyms with record fields, I think we need to disentangle two aspects of `Parent` that are now orthogonal: * whether the `Name` has a parent at all (this can change due to pattern- synonym bundling) * whether the `Name` is a record field, and if so, its label (this shouldn't change) For example, we could add a constructor to `Parent` that has a `Maybe FieldLabelString` but not a parent `Name`. This ought to be enough to make `isRecFldGRE` accurate and hence calculate the name shadowing warnings correctly (fixing this ticket). However, this isn't quite enough for #11228, for which there are other complications (see discussion on https://github.com/ghc-proposals/ghc- proposals/pull/84). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14630#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler