{"ast_node_type":"variable","tokens":[{"end":13,"kind":"keyword","start":0,"text":"let"}]}
    let pat =
        || P(ast::Ty { id, kind: ast::TyKind::MacCall(mac_placeholder()), span, tokens: None });
        || P(ast::Pat { id, kind: ast::PatKind::MacCall(mac_placeholder()), span, tokens: None });