Make cow_is_borrowed
methods const
#76139
Merged
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Constify the following methods of
alloc::borrow::Cow
:is_borrowed
is_owned
Analogous to the const methods
is_some
andis_none
for Option, andis_ok
andis_err
for Result.These methods are still unstable under
cow_is_borrowed
.Possible because of #49146 (Allow if and match in constants).
Tracking issue: #65143