#15400: Parse error on input ‘*’ -------------------------------------+------------------------------------- Reporter: Bodigrim | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: #15284 | Differential Rev(s): Phab:D4865 Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Oh dear. I've gotten confused about this again! And then I went ahead and confused Ben. I really should know better. This is expected behavior. In GHC 8.6, you have to specify `-XNoStarIsType` in order to use `*` as a type operator. We recognize that this makes for an awkward migration for some users, but, as discussed in [https://github.com/ghc-proposals/ghc-proposals/pull/83 these] [https://github.com/ghc-proposals/ghc-proposals/pull/146 proposals] (more the second one), it seemed better to do it this way than any other we could think of. Just put on `-XNoStarIsType` and you'll be off. However, do we have any migration guide? This should absolutely be in it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15400#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler