Rollup of 6 pull requests#71949

Merged

bors merged 16 commits intorust-lang:masterfrom

Dylan-DPC-zz:rollup-0gg02wd

May 6, 2020

Commits on Apr 24, 2020

Commits on May 2, 2020

SipHasher::new() is literally with SipHasher with both keys being 0
hbina
committed

Commits on May 5, 2020

Commits on May 6, 2020

Rollup merge of #71510 - ssomers:btreemap_iter_intertwined, r=Mark-Simulacrum
Dylan-DPC
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Rollup merge of #71727 - hbina:simplified_usage, r=Mark-Simulacrum
Dylan-DPC
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Rollup merge of #71889 - RalfJung:rwlock, r=Amanieu
Dylan-DPC
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Rollup merge of #71905 - mibac138:x-cmd-alias, r=Mark-Simulacrum
Dylan-DPC
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Rollup merge of #71914 - pietroalbini:relnotes-1.43.1, r=Mark-Simulacrum
Dylan-DPC
authored
Rollup merge of #71921 - RalfJung:open-mode, r=hanna-kruppe
Dylan-DPC
authored