tree e2d29c8c4b125ea5cc8af068d1527d2ce500d7e8
parent 83beb0a118f7508b2a1888bfecf4e46640b9b3c2
parent a1586f1d2b17d687444d3b94aedd7ce24ae074ed
author bors <bors@rust-lang.org> 1580003510 +0000
committer bors <bors@rust-lang.org> 1580003510 +0000

Auto merge of #68031 - Marwes:fold_list, r=estebank

perf: Avoid creating a SmallVec if nothing changes during a fold

Not sure if this helps but in theory it should be less work than what
the current micro optimization does for `ty::Predicate` lists.

(It would explain the overhead I am seeing from `perf`.)