rust/src/test/ui/nll/issue-46589.rs

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struct Foo;
impl Foo {
fn get_self(&mut self) -> Option<&mut Self> {
Some(self)
}
fn new_self(&mut self) -> &mut Self {
self
}
fn trigger_bug(&mut self) {
let other = &mut (&mut *self);
*other = match (*other).get_self() {
Some(s) => s,
None => (*other).new_self()
//~^ ERROR cannot borrow `**other` as mutable more than once at a time [E0499]
};
let c = other;
}
}
fn main() {}