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make mem::discriminant const#69825

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bors merged 6 commits intorust-lang:masterrust-lang/rust:masterfrom

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Mar 11, 2020

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Commits on Mar 8, 2020

• constify `mem::discriminant`

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• prevent potential promotion in const_discriminant

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• test discriminant of enum with uninhabited variant

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• allow dead code in discriminant test

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Commits on Mar 9, 2020

• discrimant test must not be inlined!

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Commits on Mar 10, 2020

• explain the use of a custom identity function

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