#14191: Implement Semigroup as a superclass of Monoid Proposal (Phase 2) -------------------------------------+------------------------------------- Reporter: hvr | Owner: hvr Type: task | Status: new Priority: normal | Milestone: 8.4.1 Component: libraries/base | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10365 | Differential Rev(s): phab:D3927 Wiki Page: | prime:Libraries/Proposals/SemigroupMonoid| -------------------------------------+------------------------------------- Comment (by Herbert Valerio Riedel <hvr@…>): In [changeset:"10ca8018900364579123bf3912202176d338d3c6/ghc" 10ca801/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="10ca8018900364579123bf3912202176d338d3c6" Generalise constraint on `instance Monoid (Maybe a)` to Semigroup This now becomes possible due to the introduction of the Semigroup=>Monoid superclass relation (see #14191). Reviewers: ekmett, RyanGlScott, austin, bgamari Reviewed By: ekmett, RyanGlScott, bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3972 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14191#comment:11> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler