{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
                // FIXME: This operates on the syntax tree and will produce incorrect results when
                // `struct S<'a, 'b, T>`, match `S::<$0>` to `T` and `S::<'a, $0, _>` to `'b`.
                // generic parameters are disabled by `#[cfg]` directives. It should operate on the