#16411: Inconsistent -Wpartial-fields warnings with (~) vs. (~~) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 8.6.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | https://gitlab.haskell.org/ghc/ghc/merge_requests/520 -------------------------------------+------------------------------------- Comment (by Marge Bot <ben+marge-bot@…>): In [changeset:"36546a43e490ea6f989e6cad369d1a251c94a42b/ghc" 36546a4/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="36546a43e490ea6f989e6cad369d1a251c94a42b" Fix #16411 by making dataConCannotMatch aware of (~~) The `dataConCannotMatch` function (which powers the `-Wpartial-fields` warning, among other things) had special reasoning for explicit equality constraints of the form `a ~ b`, but it did not extend that reasoning to `a ~~ b` constraints, leading to #16411. Easily fixed. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16411#comment:2> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler