Weird error messages when using `?` operator in enum discriminant value

[jruderman]

Code

playground

enum M {
    D = Some(0)?
}

fn main() {}

Current output

error[E0658]: `?` is not allowed in a `const`
 --> kfb.rs:2:9
  |
2 |     D = Some(0)?
  |         ^^^^^^^^
  |
  = note: see issue #74935 <https://github.com/rust-lang/rust/issues/74935> for more information
  = help: add `#![feature(const_try)]` to the crate attributes to enable

error[E0572]: return statement outside of function body
 --> kfb.rs:2:16
  |
2 |     D = Some(0)?
  |                ^

Why these messages are weird

• The first error refers to const, but I didn't type const. Instead, we're in a const context implied by writing = while defining an enum discriminant.
• The second error refers to return, but I didn't type return. Instead, the return comes from desugaring ?.

Ideal output

• Skip the first error
• Turn the second error into: ? operator outside function body
• Suggest replacing ? with .unwrap(), perhaps

Notes

• I noticed this while looking at fuzzer output. It's probably not important.
• Would it make sense to allow ? here as a shorthand for .unwrap()? Either way we want compilation to stop if the value is None.