rust/src/test/ui/nll/self-assign-ref-mut.rs

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// Check that `*y` isn't borrowed after `y = y`.
// check-pass
fn main() {
let mut x = 1;
{
let mut y = &mut x;
y = y;
y;
}
x;
{
let mut y = &mut x;
y = y;
y = y;
y;
}
x;
}