#8171: Extending ExtendedDefaultRules -------------------------------------+------------------------------------- Reporter: ekmett | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: | ExtendedDefaultRules Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #2641 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by crockeea): * cc: ecrockett0@… (added) Comment: Also see #12271. My primary concern there is GHC rather than GHCi. My main point there is: users should be able to specify defaults for user-defined /non-Prelude constraints; defaulting should not be a magical property baked into specific Prelude typeclasses. It sounds like the solution proposed here would require -XEDR, whereas my proposed solution just modifies the existing `default` tuple, similar to what Edward suggested at the end of [https://ghc.haskell.org/trac/ghc/ticket/8171#comment:4 comment 4]. I think removing rule 3 from the EDRs would effectively remove the "magic" that I talk about in that ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8171#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler