{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(MetaVarKind::Pat(_)) = self.token.is_metavar_seq() {
        // Make sure we don't allow e.g. `let mut $p;` where `$p:pat`.
            self.expected_ident_found_err().emit();