Change the `Fn` traits to use inheritance, not bridge impls#23282

Merged

bors merged 2 commits intorust-lang:masterfrom nikomatsakis:fn-trait-inheritance

Mar 25, 2015

+711-261

Commits on Mar 23, 2015

Make the Fn traits inherit from one another and remove the bridging
nikomatsakis
committed
Fallout from changing fn traits to use inheritance rather than bridge
nikomatsakis
committed