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// Check mutable reference bindings cannot be mutated by an if-let guard.
#![feature(if_let_guard)]
fn main() {
let mut x: Option<Option<i32>> = Some(Some(6));
match x {
Some(ref mut y) if let Some(ref mut z) = *y => {
//~^ ERROR cannot borrow `y.0` as mutable, as it is immutable for the pattern guard
let _: &mut i32 = z;
}
_ => {}
}
}
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