Doctest fail to compile, but there is nothing to test

[piegamesde]

When running the doc tests, I get the following error message:

running 2 tests
test src/core.rs - core::Wormhole::send_json (line 269) ... FAILED
test src/core.rs - core::Wormhole::connect_without_code (line 119) ... FAILED

failures:

---- src/core.rs - core::Wormhole::send_json (line 269) stdout ----
error: expected expression, found `}`
 --> src/core.rs:271:1
  |
4 | } _doctest_main_src_core_rs_269_0() }
  | ^ expected expression

error: aborting due to previous error

Couldn't compile the test.
---- src/core.rs - core::Wormhole::connect_without_code (line 119) stdout ----
error: expected expression, found `}`
 --> src/core.rs:121:1
  |
4 | } _doctest_main_src_core_rs_119_0() }
  | ^ expected expression

error: aborting due to previous error

Couldn't compile the test.

failures:
    src/core.rs - core::Wormhole::connect_without_code (line 119)
    src/core.rs - core::Wormhole::send_json (line 269)

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s

error: test failed, to rerun pass '--doc'

Source code (not minimized yet). The relevant doc comment looks like this:

    /**
     * Generate a code and connect to the rendezvous server.
     *
     * # Returns <-- this is the line shown in the error message
     *
     * A tuple with a [`WormholeWelcome`] and a [`std::future::Future`] that will
     * do the rest of the client-client handshake and yield the [`Wormhole`] object
     * on success.
     */

Meta

rustc --version --verbose:

rustc 1.60.0-nightly (4e8fb743c 2022-02-03)
binary: rustc
commit-hash: 4e8fb743ccbec27344b2dd42de7057f41d4ebfdd
commit-date: 2022-02-03
host: x86_64-unknown-linux-gnu
release: 1.60.0-nightly
LLVM version: 13.0.0

Some kind soul bisected this onto 5e57faa...777bb86 (between 2022-01-20 and 2022-01-21)

[GuillaumeGomez]

It likely comes from #93038.

[GuillaumeGomez]

I can be reproduced with both code:

pub mod Wormhole {
    /** # Returns
     *
     */
    pub fn foo() {}
    /**
     * # Returns
     *
     */
    pub fn bar() {}
}