fix: redundant_clone FP in overlapping lifetime

[profetia]

fixes #13900

changelog: [redundant_clone]: fix FP in overlapping lifetime

[rustbot]

r? @Alexendoo

rustbot has assigned @Alexendoo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[profetia]

r? clippy

[profetia]

r? clippy

[profetia]

r? clippy

[profetia]

r? clippy

[samueltardieu]

r? @samueltardieu

[samueltardieu]

The following is a false positive and the suggestion will cause an error:

    let mut a = String::new();
    let mut b = String::new();
    for _ in 1..10 {
        b = a.clone();
    }

This shows in the lintcheck run.

[samueltardieu]

@rustbot author

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[profetia]

@rustbot ready

[samueltardieu]

Could you add the test case that would wrongly trigger the lint (the assignment in a loop) so that it can act as a non regression test?

[samueltardieu]

Looks good, thanks!