On 7 June 2012 16:26, Simon Peyton-Jones <[email protected]> wrote: > It's deliberate. > > As the user manual says > (http://www.haskell.org/ghc/docs/latest/html/users_guide/flag-reference.html#id3101511), > FlexibleInstances implies TypeSynonymInstances. > See Trac http://hackage.haskell.org/trac/ghc/ticket/4841 > > I'll clarify the docs a bit.
That makes more sense now, thanks! > > Simon > > | -----Original Message----- > | From: [email protected] [mailto:haskell-cafe- > | [email protected]] On Behalf Of Ivan Lazar Miljenovic > | Sent: 06 June 2012 23:34 > | To: Haskell Cafe > | Subject: Re: [Haskell-cafe] GHC 7.4 and TypeSynonymInstances > | > | *Bump* > | > | Especially as there is now a version of the Haskell Platform based > | around GHC-7.4.1, I would appreciate it if this behaviour could be > | clarified. > | > | On 20 April 2012 15:25, Ivan Lazar Miljenovic > | <[email protected]> wrote: > | > Has there been a change in the behaviour/requirement of > | > TypeSynonymInstances as of GHC-7.4.1? (Not sure if this behaviour > | > occurs with 7.2.1 as I don't have it installed) > | > > | > I had an instance for String for a class which ghc accepted whilst > | > using FlexibleInstances; however, when trying to load it in 7.0.* it > | > stated that TypeSynonymInstances was needed (which I forgot to add > | > since it didn't seem to need it). > | > > | > All I could find in the release notes was that as of 7.2.1, both > | > extensions were needed, not that one implied the other: > | > http://www.haskell.org/ghc/docs/7.4.1/html/users_guide/release-7-2-1.h > | > tml#id3003826 > | > > | > Is this behaviour deliberate, or a bug? > | > > | > -- > | > Ivan Lazar Miljenovic > | > [email protected] > | > http://IvanMiljenovic.wordpress.com > | > | > | > | -- > | Ivan Lazar Miljenovic > | [email protected] > | http://IvanMiljenovic.wordpress.com > | > | _______________________________________________ > | Haskell-Cafe mailing list > | [email protected] > | http://www.haskell.org/mailman/listinfo/haskell-cafe > > -- Ivan Lazar Miljenovic [email protected] http://IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
