warning: trait method `try_into` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-turbofish.rs:19:5
   |
LL |     x.try_into::<usize>().or(Err("foo"))?.checked_sub(1);
   |     ^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `AnnotatableTryInto::try_into::<usize>(x)`
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/prelude.html>
note: the lint level is defined here
  --> $DIR/future-prelude-collision-turbofish.rs:6:9
   |
LL | #![warn(rust_2021_prelude_collisions)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: trait method `try_into` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-turbofish.rs:23:5
   |
LL |     x.try_into::<usize>().or(Err("foo"))?;
   |     ^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `AnnotatableTryInto::try_into::<usize>(x)`
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/prelude.html>

warning: 2 warnings emitted