ra have trouble to expand procedural macro of the xflags crate when doc comment is used

[nerditation]

rust-analyzer version:

rust-analyzer version: 0.4.1935-standalone (73a4275 2024-04-24)

rustc version:

rustc 1.79.0-nightly (ccfcd950b 2024-04-15)

editor or extension:

vscode extension version: 0.4.1935 (pre-release)

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)
none

code snippet to reproduce:

// cargo add xflags@0.3.2
xflags::xflags! {
    /// doc comment lines cause problems
    cmd example {
    }
}
fn main() {
    let _cli = Example::from_env_or_exit();
}

---

some notes:

• the code is perfectly good;

  • can run cargo build and cargo run
  • also cargo expand shows correct output

• vscode command "expand macro recursively at caret" output is EMPTY;

• ra doesn't seem to report any errors, as far as I can see, even with RA_LOG = info

• the macro generated types won't appear in code completion candidate list;

• removing doc comment lines "fixes" the problem;

• changing doc comment lines into equivalent #[doc = "..."] attributes also "fixes" the problem,

  • e.g. ra can expand and parse this code without any problem:

  xflags::xflags! {
      #[doc ="this has no problem at all"]
      cmd example {
      }
  }

[Veykril]

Duplicate of #16259