error[E0015]: cannot call non-const method `<cross_crate::NonConst as cross_crate::MyTrait>::func` in constant functions
  --> $DIR/cross-crate.rs:19:14
   |
LL |     NonConst.func();
   |              ^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error[E0658]: cannot call conditionally-const method `<cross_crate::Const as cross_crate::MyTrait>::func` in constant functions
  --> $DIR/cross-crate.rs:22:11
   |
LL |     Const.func();
   |           ^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
   = note: see issue #143874 <https://github.com/rust-lang/rust/issues/143874> for more information
   = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0015, E0658.
For more information about an error, try `rustc --explain E0015`.