constify Cow::Owned types#146532
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`Cow` already has a `Deref<Target=B>` implementation that is `const` when the `Borrow` impl from the owned type is also `const`. However, none of the major types actually implement this, so the `Deref` impl doesn't really work. This change constifies the two major `Cow::Owned` types so that the `Deref` impl on `Cow` will work for those two types.
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This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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☔ The latest upstream changes (presumably #152574) made this pull request unmergeable. Please resolve the merge conflicts. |
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Cowalready has aDeref<Target=B>implementation that isconstwhen theBorrowimpl from the owned type is alsoconst. However, none of the major types actually implement this, so theDerefimpl doesn't really work.This change constifies the two major
Cow::Ownedtypes so that theDerefimpl onCowwill work for those two types.