| //@ edition:2015 | |
| //@ 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> 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 | |
| } |