#8961: Require PatternSynonyms language extension to *use* pattern synonyms -------------------------------------+------------------------------------- Reporter: cactus | Owner: cactus Type: bug | Status: closed Priority: normal | Milestone: 7.8.1 Component: Compiler (Type | Version: 7.8.1-rc2 checker) | Keywords: Resolution: fixed | Architecture: Unknown/Multiple Operating System: Unknown/Multiple | Difficulty: Easy (less than 1 Type of failure: None/Unknown | hour) Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Comment (by cactus): I did this because I thought requiring the language pragma at use sites is the more conservative choice, given that `PatternSynonyms` is more of a tech preview than a full feature yet (see #8581, #8582, #8583, #8779 for some of the missing features from the original proposal; #8584 and #8761 for more pressing issues, #8968 for a potentially deeper rabbit hole). If that is the consensus, I have no problems with reverting this, but I think for 7.8.1 we should leave this in so that it requires effort (and thus it cannot go unnoticed) if you use this feature. A future release with the above-mentioned problems addressed could then remove this hoop to jump through. So my vote is on keeping this. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8961#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler