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Rollup merge of #138508 - hkBst:patch-3, r=wesleywiser

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Clarify "owned data" in E0515.md

This clarifies the explanation of why this is not allowed and also what to do instead.

Fixes #62071

PS There was suggestion of adding a link to the book. I did not yet do that, but if desired that could be added.
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Matthias Krüger 2025-03-17 22:49:05 +01:00 • committed by GitHub
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9
compiler/rustc_error_codes/src/error_codes/E0515.md
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@ -17,10 +17,13 @@ fn get_dangling_iterator<'a>() -> Iter<'a, i32> {
}
```
Local variables, function parameters and temporaries are all dropped before the
end of the function body. So a reference to them cannot be returned.
Local variables, function parameters and temporaries are all dropped before
the end of the function body. A returned reference (or struct containing a
reference) to such a dropped value would immediately be invalid. Therefore
it is not allowed to return such a reference.
Consider returning an owned value instead:
Consider returning a value that takes ownership of local data instead of
referencing it:
```
use std::vec::IntoIter;