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`
   |
note: the lint level is defined here
  --> $DIR/future-prelude-collision-generic.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 issue #85684 <https://github.com/rust-lang/rust/issues/85684>

warning: trait-associated function `from_iter` will become ambiguous in Rust 2021
  --> $DIR/future-prelude-collision-generic.rs:31:5
   |
LL |     Generic::<i32, i32>::from_iter(1);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<Generic::<i32, 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 issue #85684 <https://github.com/rust-lang/rust/issues/85684>

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 issue #85684 <https://github.com/rust-lang/rust/issues/85684>

warning: 3 warnings emitted