#10751: Implement Phase 1 of MonadFail Proposal (MFP) -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: task | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: report- | impact Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by quchen): Current status: - Warnings are issued for missing MonadFail instances. These warnings are on by default and can be toggled with a flag. - The (->)r Monad doesn't yield the correct error message yet: it displays as "m r" in the "missing MonadFail" message. - There is a flag to turn on the actual desugaring. It's turned off by default, but can be used to get a hard error if something's been forgotten. - The testsuite has been mostly fixed (not sure whether the failing tests are our fault, didn't check it yet) - We have lots of WIP commits that aren't very good versioning practice, so the actual patch will need to be squashed down to a handful of useful ones. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10751#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler