macros: fix inert attributes from `proc_macro_derives` with `#![feature(proc_macro)]`#39572

Merged

bors merged 2 commits intorust-lang:masterfrom jseyfried:fix_inert_attributes

Feb 13, 2017

Commits on Feb 12, 2017

Move legacy custom derives collection into resolver.find_attr_invoc().
jseyfried
committed
Allow using inert attributes from proc_macro_derives with #![feature(proc_macro)].
jseyfried
committed