rust/tests/ui/error-codes/E0502.rs

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fn bar(x: &mut i32) {}
fn foo(a: &mut i32) {
let ref y = a;
bar(a); //~ ERROR E0502
y.use_ref();
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}
fn main() {
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}
trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
impl<T> Fake for T { }