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#![feature(rustc_attrs)]
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fn main() { #![rustc_error] // rust-lang/rust#49855
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let mut x = "foo";
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let y = &mut x;
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let z = &mut x; //~ ERROR cannot borrow
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z.use_mut();
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y.use_mut();
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}
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trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
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impl<T> Fake for T { }
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