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Implement flatten for Option<&Option<T>>
and Option<&mut Option<T>>
#108671
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r? @cuviper (rustbot has picked a reviewer for you, use r? to override) |
Hey! It looks like you've submitted a new PR for the library teams! If this PR contains changes to any Examples of
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Please do create an API Change Proposal as linked above. @rustbot label +T-libs-api -T-libs |
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r? libs-api |
☔ The latest upstream changes (presumably #130829) made this pull request unmergeable. Please resolve the merge conflicts. |
Submitting this to see if it can be done as a pr or if it needs to be a RFC.
Creates
.flatten_ref()
to get a immutable reference of a nested option and.flatten_mut()
for mutable references. Return type isOption<&T>
as&Option<T>
would require returning a references toNone
which can't be done in constant functions.ACP: rust-lang/libs-team#186