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// edition:2018
// check-pass
#![deny(unused_mut)]
type A = Vec<u32>;
async fn a(n: u32, mut vec: A) {
vec.push(n);
}
async fn b(n: u32, ref mut vec: A) {
vec.push(n);
}
async fn c(ref vec: A) {
vec.contains(&0);
}
async fn d((a, mut b): (A, A)) {
b.push(1);
}
async fn f((ref mut a, ref b): (A, A)) {}
async fn g(((ref a, ref mut b), (ref mut c, ref d)): ((A, A), (A, A))) {}
fn main() {}
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