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Rollup of 5 pull requests#60084

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Centril wants to merge 16 commits intorust-lang:masterrust-lang/rust:masterfrom Centril:rollup-ene82xrCentril/rust:rollup-ene82xrCopy head branch name to clipboard

+135-41

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Commits on Apr 16, 2019

• implement nth_back for Bytes

  koalatux

  committed
  cc2689a

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• implement nth_back for Fuse

  koalatux

  committed
  fae2a68

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• implement nth_back for Enumerate

  koalatux

  committed
  2605537

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Commits on Apr 17, 2019

• Update rustfmt to 1.2.1

  topecongiro

  committed
  ca19ffe

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Commits on Apr 18, 2019

• whitelist rtm x86 cpu feature

  mtak-

  committed
  365a48a

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• Simplify the returning of a Result a bit

  janhohenheim

  committed
  379c541

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• Update run-make PGO test to new commandline syntax.

  michaelwoerister

  committed
  553ec5d

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• Prefix PROFILER_SUPPORT and SANITIZER_SUPPORT test env vars with RUSTC_ to make things clearer.

  michaelwoerister

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  4269be3

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• compiletest: Allow for tests requiring profiler-rt or sanitizer-rt support.

  michaelwoerister

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  227be65

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• Add codegen test that makes sure PGO instrumentation is emitted as expected.

  michaelwoerister

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  e2acaee

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• Use new needs-(profiler|sanitizer)-support compiletest directive to clean up some run-make tests.

  michaelwoerister

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  cc77087

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• Rollup merge of rust-lang#60023 - koalatux:nth-back, r=scottmcm

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  Centril

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• Rollup merge of rust-lang#60038 - michaelwoerister:pgo-updates-2, r=alexcrichton

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  Centril

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• Rollup merge of rust-lang#60041 - jnferner:patch-1, r=shepmaster

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  Centril

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• Rollup merge of rust-lang#60056 - topecongiro:rustfmt-1.2.1, r=alexcrichton

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• Rollup merge of rust-lang#60060 - mtak-:rtm-x86-feature, r=petrochenkov

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  Centril

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