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Handle anonymous wild cards in type or data family instance declarations like unnamed type variables. For instance (pun intented): type family F (a :: *) (b :: *) :: * type instance F Int _ = Int Is now the same as: type family F (a :: *) (b :: *) :: * type instance F Int x = Int Note that unlike wild cards in partial type signatures, no errors (or warnings with -XPartialTypeSignatures) are generated for these wild cards, as there is nothing interesting to report to the user, i.e. the inferred kind. Only anonymous wild cards are supported here, named and extra-constraints wild card are not. Test Plan: pass new tests Reviewers: goldfire, austin, simonpj, bgamari Reviewed By: simonpj, bgamari Subscribers: goldfire, thomie Differential Revision: https://phabricator.haskell.org/D1092 GHC Trac Issues: #3699, #10586
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