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rustc: T: 'empty always holds for all types. - #42482
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nikomatsakis
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@bors r+ |
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rustc: T: 'empty always holds for all types. Fixes#42467 by special-casing `ReEmpty` to always hold, even for parameters. The reason this is the case is that `ReEmpty` is the result of inferring a region variable with no constraints attached to it, so there is no lifetime a type would contain which would be strictly shorter. r? @nikomatsakis
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☀️ Test successful - status-appveyor, status-travis |
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Fixes#42467 by special-casing
ReEmptyto always hold, even for parameters.The reason this is the case is that
ReEmptyis the result of inferring a region variable with no constraints attached to it, so there is no lifetime a type would contain which would be strictly shorter.r? @nikomatsakis