rust-analyzer: Shadowed macro causes macro-error

The first foo!(1); uses to the subsequent shadowed macro_rules! foo. Causing expected leaf: `,` rust-analyzer(macro-error). Performing “Go to Definition” confirms this, as the cursor jumps to the second macro_rules! foo.

fn main() {
    macro_rules! foo {
        ($a:expr) => {};
    }

    foo!(1);

    macro_rules! foo {
        ($a:expr, $b:expr) => {};
    }

    foo!(1, 2);
}

This issue must have been introduced lately, as a few weeks ago this was not an issue.

Issue exists on both stable and the latest nightly release:

• rust-analyzer version: 2020-12-28 (1d53075)
• rust-analyzer version: nightly (77ad203)