tests/mir-opt/const_prop/mutable_variable_aggregate_mut_ref.rs

// skip-filecheck
// unit-test: ConstProp

// EMIT_MIR mutable_variable_aggregate_mut_ref.main.ConstProp.diff
fn main() {
    let mut x = (42, 43);
    let z = &mut x;
    z.1 = 99;
    let y = x;
}