// check-pass
// run-rustfix
// edition 2018
#![warn(rust_2021_prelude_collisions)]
trait MyTrait {
fn from_iter(x: Option);
}
impl MyTrait<()> for Vec {
fn from_iter(_: Option<()>) {}
}
fn main() {
as MyTrait<_>>::from_iter(None);
//~^ WARNING trait-associated function `from_iter` will become ambiguous in Rust 2021
//~^^ WARNING this is accepted in the current edition
}