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better support for empty patterns#677

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v-gb wants to merge 4 commits intorust-lang:masterrust-lang/regex:masterfrom

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Commits on May 11, 2020

• tests: add test that some counted repetition are rejected

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  dc9378b

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• hir: make is_alternation_literal say false on Empty

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• tests: add tests involving the Empty regex

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  bd63e7f

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• compile: support empty patterns better

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