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Rollup of 6 pull requests#65885

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bors merged 16 commits intorust-lang:masterrust-lang/rust:masterfrom

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Oct 28, 2019

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Commits on Oct 19, 2019

• Stabilize `Option::flatten`

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Commits on Oct 27, 2019

• syntax/attr: reduce reliance on parser

  Centril

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

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• librustc_lexer: Enhance documentation

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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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• Implement core::intrinsics::caller_location.

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  anp

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• Panicking infra uses &core::panic::Location.

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• Implementation of const caller_location.

  anp

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• Always use consteval to codegen caller_location.

  anp

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• Gather together usefulness tests

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Commits on Oct 28, 2019

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

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  Centril

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• Rollup merge of #65664 - anp:panic-location, r=eddyb

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  Centril

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

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

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

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• Rollup merge of #65880 - Nadrieril:gather-usefulness-tests, r=varkor

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