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Rollup of 3 pull requests#57930

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Centril wants to merge 6 commits intorust-lang:masterrust-lang/rust:masterfrom

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Commits on Jan 25, 2019

• Unused variable suggestions on all patterns.

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  davidtwco

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Commits on Jan 26, 2019

• Enable RISC-V atomic compare and swap

  fintelia

  committed
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• Remove lexical scope examples from std::mem::drop

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  Alexendoo

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Commits on Jan 27, 2019

• Rollup merge of #57899 - davidtwco:issue-56685, r=estebank

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  Centril

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• Rollup merge of #57925 - fintelia:riscv-cas, r=nagisa

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  Centril

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• Rollup merge of #57927 - Alexendoo:mem-drop-nll-docs, r=Centril

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  Centril

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