warning: trait method `try_into` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-macros.rs:39:5
   |
LL |     foo!().try_into(todo!());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `MyTry::try_into(foo!(), todo!())`
   |
   = 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-macros.rs:4:9
   |
LL | #![warn(rust_2021_prelude_collisions)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: trait-associated function `try_from` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-macros.rs:42:5
   |
LL |     <bar!()>::try_from(0);
   |     ^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<bar!() as TryFromU8>::try_from`
   |
   = 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