Missing comma in enum interacts badly with doc comment advice

[richlowe]

Code

enum Foo {
    /// Like the noise a sheep makes
    Bar
    /// Like where people drink
    Baa
}

Current output

Compiling playground v0.0.1 (/playground)
error: expected one of `(`, `,`, `=`, `{`, or `}`, found doc comment `/// Like where people drink`
 --> src/lib.rs:4:5
  |
3 |     Bar
  |        - expected one of `(`, `,`, `=`, `{`, or `}`
4 |     /// Like where people drink
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unexpected token
  |
help: add a space before the last `/` to write a regular comment
  |
4 |     // / Like where people drink
  |       +
help: missing `,`
  |
3 |     Bar,
  |        +

error: could not compile `playground` (lib) due to 1 previous error

Desired output

Compiling playground v0.0.1 (/playground)
error: expected one of `(`, `,`, `=`, `{`, or `}`, found doc comment `/// Like where people drink`
 --> src/lib.rs:4:5
  |
3 |     Bar
  |        - expected one of `(`, `,`, `=`, `{`, or `}`
4 |     /// Like where people drink
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unexpected token
help: missing `,`
  |
3 |     Bar,
  |        +

error: could not compile `playground` (lib) due to 1 previous error

Rationale and extra context

The output about the doc comment is a red herring, and shouldn't be there

Other cases

Rust Version

rustc 1.88.0-beta.5 (645b44edd 2025-06-01)
binary: rustc
commit-hash: 645b44edd3717f02838d07ba9bdd2554b0cdc0c5
commit-date: 2025-06-01
host: x86_64-unknown-illumos
release: 1.88.0-beta.5
LLVM version: 20.1.5

(I also saw this in the playground at https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=bafef64b4eb91a9b0df98d2e4c6c660b)

Anything else?

No response

[xizheyin]

@rustbot claim