Re: [GHC] #11535: Derived instance of Read/Show causes runtime exception for infix Unicode value constructors

#11535: Derived instance of Read/Show causes runtime exception for infix Unicode value constructors -------------------------------------+------------------------------------- Reporter: nushio | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: unicode Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #1544, #11529 | Differential Rev(s): Phab:D1884 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"1ef7add01ead4cbe065297f68306d9bc4b456156/ghc" 1ef7add/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="1ef7add01ead4cbe065297f68306d9bc4b456156" Add test (only) to assure that #11535 is fixed Ticket #11535 dealt with derived Read instances of infix Unicode value constructors. GHC 7.10.3 used to derive (Read/Show) instances so that `read . show` for values of such types had no parse. The issue has been fixed by other compiler update. This patch adds only tests, so that derived instance of Read/Show for infix Unicode value constructors has correct parse, satisfying Haskell 2010 Specification. Resolves: #11535 Test Plan: `make test TEST=T11535` Reviewers: austin, rwbarton, thomie, bgamari Reviewed By: rwbarton, thomie, bgamari Subscribers: rwbarton, thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D1884 GHC Trac Issues: #11535 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11535#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler