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Lifetime of borrowed values should be extended #6721

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lilyball opened this issue May 24, 2013 · 1 comment
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Lifetime of borrowed values should be extended #6721

lilyball opened this issue May 24, 2013 · 1 comment

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@lilyball
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When borrowing an owned value, the lifetime of the value should be extended at least to the end of the current statement, and perhaps extended to the full lifetime of the borrow.

Extending the lifetime to the end of the current statement would allow constructs like the following to work:

foo(vec::from_elem(16, 0).slice(0,4));

Extending the lifetime to the full lifetime of the borrow would just be a bit more convenient for the programmer who doesn't care about having an owned pointer, although it may not be worth the complexity.

@nikomatsakis
@nikomatsakis
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I agree. Dup of #3511.

flip1995 pushed a commit to flip1995/rust that referenced this issue Feb 25, 2021
@bors
Auto merge of rust-lang#6765 - camsteffen:unnecessary-wraps-pedantic,…
8a47901 
… r=flip1995

Change unnecessary_wraps to pedantic

changelog: Change unnecessary_wraps to pedantic

There seems to be enough evidence that this lint is not wanted as warn-by-default. Attempted before at rust-lang#6380. False positives at rust-lang#6721 and rust-lang#6427. Actually requested to change the category at rust-lang#6726.

Closes rust-lang#6726
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@lilyball @nikomatsakis