use `ParamName` to track in-scope lifetimes instead of Ident#63501

Merged

bors merged 4 commits intorust-lang:masterfrom nikomatsakis:issue-63500-async-anon-impl-lifetime

Aug 14, 2019

+94-9

Commits on Aug 12, 2019

Commits on Aug 13, 2019

clear in-scope lifetimes for nested items in HIR lowering
nikomatsakis
committed