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Seems similar to #84612

Cc @kornelski

IMHO this is a good idea. This is an io type returning io::Error, and users should be treating this API seriously as something that may fail.

It may be worth making this explicit in the documentation that it applies to Vec too.

PR #84612 got postponed in hope that oom=panic will make it unnecessary, but oom=panic is being removed! So the other PR should be revived too.

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.

The use of these methods will most likely be in generic context anyway, where errors will be properly handled.