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add a chapter on enum representation#57

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nikomatsakis merged 14 commits intorust-lang:masterrust-lang/unsafe-code-guidelines:masterfrom

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Jan 10, 2019

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Commits on Jan 10, 2019

• add a chapter on enum representation

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• rename representation -> layout

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• revise to take feedback into account:

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• give example where it can be more efficient

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• clarify section headers a bit more

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• s/enums/variants/

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• clarify that `#[repr(C)]` matches *default* settings of C compiler

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• don't guarantee at least one byte

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• add `#[repr(C)]` to the union

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• s/representation invariant/validity invariant/

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• rename representation to layout in header

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• use `repr` and not "representation"

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• add an unresolved question

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• clarify disclaimer text

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