#14642: ‘class C using’ fails to parse with MonadComprehensions -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- `TransformListComp` / `MonadComprehensions` reserve `using` but should this not work? {{{#!hs {-# Language TransformListComp #-} class C using }}} gives {{{ $ ghci -ignore-dot-ghci /tmp/X.hs GHCi, version 8.5.20180105: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( /tmp/X.hs, interpreted ) /tmp/X.hs:3:9: error: parse error on input ‘using’ | 3 | class C using | ^^^^^ Failed, no modules loaded. Prelude> }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14642 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler