error: trait methods cannot be stable const fn
  --> $DIR/staged-api.rs:22:5
   |
LL | /     fn func() {
LL | |
LL | |     }
   | |_____^

error: `<staged_api::Unstable as staged_api::MyTrait>::func` is not yet stable as a const fn
  --> $DIR/staged-api.rs:34:5
   |
LL |     Unstable::func();
   |     ^^^^^^^^^^^^^^^^
   |
   = help: add `#![feature(staged)]` to the crate attributes to enable

error: aborting due to 2 previous errors