Rollup of 12 pull requests#66436

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JohnTitor wants to merge 31 commits into

rust-lang:masterfrom

JohnTitor:rollup-kphyb2i

Commits on Oct 22, 2019

rename Error::iter_chain() and remove Error::iter_sources()
haraldh
committed

Commits on Nov 3, 2019

Avoid hashing the key twice in `get_query()`.
nnethercote
committed

Commits on Nov 13, 2019

Commits on Nov 14, 2019

Commits on Nov 15, 2019