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Rollup of 7 pull requests#65878

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Centril wants to merge 19 commits intorust-lang:masterrust-lang/rust:masterfrom Centril:rollup-frxkcrvCentril/rust:rollup-frxkcrvCopy head branch name to clipboard

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Commits on Aug 24, 2019

• Add 'must_use' to all functions 'fn(float) -> float'

  

  Kyle Strand

  committed
  6b02362

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Commits on Aug 28, 2019

• Add reason for each 'must_use'

  

  Kyle Strand

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• Annotate functions taking extra args

  

  Kyle Strand

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• Let 'clamp' be invoked without using return value; used in tests

  

  Kyle Strand

  committed
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Commits on Sep 5, 2019

• Restore 'must_use' for 'clamp'; fix warning for tests

  

  Kyle Strand

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Commits on Oct 19, 2019

• Stabilize Option::flatten

  eopb

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Commits on Oct 27, 2019

• syntax/attr: reduce reliance on parser

  Centril

  committed
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• rustc, rustc_passes: don't depend on syntax_expand.

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  Centril

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• librustc_lexer: Enhance documentation

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  popzxc

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• doc: explain why it is unsafe to construct Vec<u8> from Vec<u16>

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  tesuji

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  steveklabnik

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• Point at local similarly named element and tweak references to variants

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  estebank

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• doc: introduce once in iter::chain document

  tesuji

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• Rollup merge of rust-lang#63871 - BatmanAoD:FloatFnMustUse, r=withoutboats

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  Centril

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• Rollup merge of rust-lang#64747 - ethanboxx:master, r=Centril

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  Centril

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• Rollup merge of rust-lang#65421 - estebank:variants, r=petrochenkov

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  Centril

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• Rollup merge of rust-lang#65792 - Centril:split-syntax-2, r=petrochenkov

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• Rollup merge of rust-lang#65849 - popzxc:document-librustc_lexer, r=petrochenkov

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  Centril

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• Rollup merge of rust-lang#65873 - lzutao:doc-vec-from-raw-parts, r=rkruppe

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• Rollup merge of rust-lang#65877 - lzutao:iter-chain-once, r=Centril

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  Centril

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