File: issue-42106.rs

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rustc 1.85.0%2Bdfsg3-1
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fn do_something<T>(collection: &mut Vec<T>) {
    let _a = &collection;
    collection.swap(1, 2); //~ ERROR also borrowed as immutable
    _a.use_ref();
}

fn main() { }

trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
impl<T> Fake for T { }