#11607: ApplicativeDo easily foiled with `pure` -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: patch Priority: high | Milestone: 8.0.1 Component: Compiler (Type | Version: 8.0.1-rc2 checker) | Resolution: | Keywords: ApplicativeDo Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: ado/T11607 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1931 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Yikes! there is no user-manual documentation about the magical behaviour of `return`. Adding more magic (`pure` or `return`) sees uncool. E.g. if I have {{{ }}} then using `blah` will surprisingly fail. Simon M? Regardless whatever the behaviour is ought to be carefully specified in the user manual. So I'm not complaining about Phab:D1931, but rather asking for proper documentation. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11607#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler