#13469: -fdefer-type-errors for Backpack -------------------------------------+------------------------------------- Reporter: ezyang | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 8.1 Keywords: backpack | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- It would be great if `-fdefer-type-errors` worked with Backpack. There are two senses in which it could work: 1. When matching signatures, if the instantiating module didn't provide a required function, we could just create one out of thin air so we can continue building. 2. When matching signature, if the implementation doesn't match the signature, we instead create a deferred type error. (2) is more difficult because it basically requires us to solve #12703. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13469 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler