Gentoo's Bugzilla –
Attachment 495522 Details for
Bug 631476gnome-extra/synapse-0.2.99.2 : /.../result-set.vala:60.5-60.61: error: overriding method Synapse.ResultSet.iterator is incompatible with base method Gee.Iterable.iterator : Base method expected return type Gee.Iterator<Gee.Map.Entry<Synapse.Match,int>> ,