warning: trait-associated function `try_from` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-generic-trait.rs:24:9
   |
LL |         U::try_from(self)
   |         ^^^^^^^^^^^ help: disambiguate the associated function: `<U as PyTryFrom<'_, _>>::try_from`
   |
note: the lint level is defined here
  --> $DIR/future-prelude-collision-generic-trait.rs:5:9
   |
LL | #![warn(rust_2021_prelude_collisions)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = 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: 1 warning emitted