error[E0599]: no method named `try_into` found for type `u8` in the current scope
  --> $DIR/future-prelude-collision-shadow.rs:27:26
   |
LL |         let _: u32 = 3u8.try_into().unwrap();
   |                          ^^^^^^^^ method not found in `u8`
   |
   = help: items from traits can only be used if the trait is in scope
   = note: 'std::convert::TryInto' is included in the prelude starting in Edition 2021
help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
   |
LL +     use crate::m::TryIntoU32;
   |
LL +     use std::convert::TryInto;
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.