Automatic fix fails for assert_eq! macros

[yourlogarithm]

Summary

When running cargo clippy --fix on the provided test module, cargo writes an additional assert_eq! statement like this
assert_eq!assert_eq!(, leading to reported errors:

error: expected one of `(`, `[`, or `{`, found `assert_eq`
   --> validator-api/src/main.rs:166:19
    |
166 |         assert_eq!assert_eq!(
    |                   ^^^^^^^^^ expected one of `(`, `[`, or `{`

Reproducer

I tried this code:

#[cfg(test)]
mod test {
    #[tokio::test]
    async fn foo() {
        assert_eq!(2 + 2, 4)
    }
}

I expected to see this happen:

$ cargo clippy --fix --allow-dirty --allow-staged
    Checking validator-api v0.1.0
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.04s

Instead, this happened:

$ cargo clippy --fix --allow-dirty --allow-staged
    Checking validator-api v0.1.0
warning: failed to automatically apply fixes suggested by rustc to crate `validator_api`

after fixes were automatically applied the compiler reported errors within these files:

  * validator-api/src/main.rs

This likely indicates a bug in either rustc or cargo itself,
and we would appreciate a bug report! You're likely to see
a number of compiler warnings after this message which cargo
attempted to fix but failed. If you could open an issue at
https://github.com/rust-lang/rust-clippy/issues
quoting the full output of this command we'd be very appreciative!
Note that you may be able to make some more progress in the near-term
fixing code with the `--broken-code` flag

The following errors were reported:
error: expected one of `(`, `[`, or `{`, found `assert_eq`
   --> validator-api/src/main.rs:332:19
    |
332 |         assert_eq!assert_eq!(2 + 2, 4)
    |                   ^^^^^^^^^ expected one of `(`, `[`, or `{`

error: aborting due to 1 previous error

Original diagnostics will follow.

warning: unneeded `return` statement
   --> validator-api/src/main.rs:332:19
    |
332 |         assert_eq!(2 + 2, 4)
    |                   ^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
    = note: `#[warn(clippy::needless_return)]` on by default
help: remove `return`
    |
332 |         assert_eq!assert_eq!(2 + 2, 4)
    |                   ~~~~~~~~~~~~~~~~~~~~

warning: `validator-api` (bin "validator-api" test) generated 1 warning (run `cargo clippy --fix --bin "validator-api" --tests` to apply 1 suggestion)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.94s

Version

rustc 1.83.0-nightly (7608018cb 2024-09-29)
binary: rustc
commit-hash: 7608018cbdac9e55d0d13529cf43adc33d53efcf
commit-date: 2024-09-29
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Additional Labels

No response