warning: trait-associated function `from_iter` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-generic.rs:28:5
   |
LL |     Generic::from_iter(1);
   |     ^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<Generic<'_, _> as MyFromIter>::from_iter`
   |
   = 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-generic.rs:5:9
   |
LL | #![warn(rust_2021_prelude_collisions)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: trait-associated function `from_iter` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-generic.rs:31:5
   |
LL |     Generic::<'static, i32>::from_iter(1);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<Generic::<'static, i32> as MyFromIter>::from_iter`
   |
   = 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: trait-associated function `from_iter` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-generic.rs:34:5
   |
LL |     Generic::<'_, _>::from_iter(1);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<Generic::<'_, _> as MyFromIter>::from_iter`
   |
   = 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: 3 warnings emitted