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//! This test checks the correct parameter handling during virtual method calls
//! through a `dyn Trait` object.
//!
//! Regression test for: <https://github.com/rust-lang/rust/issues/137646>
//@ run-pass
use std::hint::black_box;
type T = (i32, i32, i32);
pub trait Trait {
fn m(&self, _: T, _: T) {}
}
impl Trait for () {
fn m(&self, mut _v1: T, v2: T) {
_v1 = (0, 0, 0);
check(v2);
}
}
pub fn run_1(trait_: &dyn Trait) {
let v1 = (1, 1, 1);
let v2 = (1, 1, 1);
trait_.m(v1, v2);
}
pub fn run_2(trait_: &dyn Trait) {
let v1 = (1, 1, 1);
let v2 = (1, 1, 1);
trait_.m(v1, v2);
check(v1);
check(v2);
}
#[inline(never)]
fn check(v: T) {
assert_eq!(v, (1, 1, 1));
}
fn main() {
black_box(run_1 as fn(&dyn Trait));
black_box(run_2 as fn(&dyn Trait));
run_1(&());
run_2(&());
}
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