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Backport fix for rustdoc overflows#55590

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nikomatsakis wants to merge 5 commits intorust-lang:stablerust-lang/rust:stablefrom nikomatsakis:predicate_may_hold-failure-backportnikomatsakis/rust:predicate_may_hold-failure-backportCopy head branch name to clipboard

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Commits on Nov 1, 2018

• Replace bug! call with Overflow

  

  GuillaumeGomez

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  nikomatsakis

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  b4a6945

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• give a more informative failure in this case

  nikomatsakis

  committed
  7cb74d5

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• don't cache overflow results globally

  nikomatsakis

  committed
  15bab94

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• expose evaluate_obligation that captures overflow, use in rustdoc

  nikomatsakis

  committed
  0150fe1

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• add regression test

  nikomatsakis

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  ffaf7ee

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