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// check-pass
// run-rustfix
// edition 2018
#![warn(rust_2021_prelude_collisions)]
trait MyTrait<A> {
fn from_iter(x: Option<A>);
}
impl<T> MyTrait<()> for Vec<T> {
fn from_iter(_: Option<()>) {}
}
fn main() {
<Vec<i32>>::from_iter(None);
//~^ WARNING trait-associated function `from_iter` will become ambiguous in Rust 2021
//~^^ WARNING this is accepted in the current edition
}
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