#11661: Missing MonadFail instance for Q monad from TemplateHaskell -------------------------------------+------------------------------------- Reporter: PeterTrsko | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Template Haskell | Version: 8.0.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by quchen): The question is, what do we gain? It would not be clear why Quasi has a MonadFail superclass, and I cannot imagine many functions might want to make use of Q's `fail`. Are we in danger of breaking any code because `fail` is removed from `Monad`, does TH rely on its existence? Maybe we should fix those cases instead. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11661#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler