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Rollup of 6 pull requests#69012

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bors merged 20 commits intorust-lang:masterrust-lang/rust:masterfrom

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Feb 10, 2020

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Commits on Feb 9, 2020

• Make `num::NonZeroX::new` an unstable `const fn`

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• Test `NonZeroU8::new` in a const context

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• Don't parse `mut a @ b` as `mut a @ mut b`

  matthewjasper

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• Print `after` effect in default graphviz formatter

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  ecstatic-morse

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• Add option to `dot::render` for monospace font

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• Remove unnecessary allows

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• Don't break first line

  ecstatic-morse

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• Use nicer alignment when printing state vectors

  ecstatic-morse

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• parser: Keep current and previous tokens precisely

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  petrochenkov

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• Reduce the number of `RefCell`s in `InferCtxt`.

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  nnethercote

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• Reduce queries/map lookups done by coherence

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  jonas-schievink

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• Add desc to `specialization_graph_of` query

  jonas-schievink

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• Defer error span calculation until needed

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  jonas-schievink

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• Remove vestigial #43355-compat code

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Commits on Feb 10, 2020

• Rollup merge of #68694 - nnethercote:reduce-RefCells-in-InferCtxt, r=varkor

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  Dylan-DPC

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• Rollup merge of #68966 - jonas-schievink:coherence-perf, r=varkor

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• Rollup merge of #68976 - ecstatic-morse:const-non-zero, r=dtolnay

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• Rollup merge of #68992 - matthewjasper:imm-binding-after-at, r=Centril

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• Rollup merge of #69005 - ecstatic-morse:unified-dataflow-graphviz, r=wesleywiser

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• Rollup merge of #69006 - petrochenkov:prevspan2, r=Centril

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