1warning: trait method `try_into` will become ambiguous in Rust 2021 2 --> $DIR/future-prelude-collision-turbofish.rs:19:5 3 | 4LL | x.try_into::<usize>().or(Err("foo"))?.checked_sub(1); 5 | ^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `AnnotatableTryInto::try_into::<usize>(x)` 6 | 7note: the lint level is defined here 8 --> $DIR/future-prelude-collision-turbofish.rs:6:9 9 | 10LL | #![warn(rust_2021_prelude_collisions)] 11 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 12 = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! 13 = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/prelude.html> 14 15warning: trait method `try_into` will become ambiguous in Rust 2021 16 --> $DIR/future-prelude-collision-turbofish.rs:23:5 17 | 18LL | x.try_into::<usize>().or(Err("foo"))?; 19 | ^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `AnnotatableTryInto::try_into::<usize>(x)` 20 | 21 = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! 22 = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/prelude.html> 23 24warning: 2 warnings emitted 25 26