{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
    // Note that `kw::Default` is "default" and `sym::Default` is "Default"!
fn default_call(cx: &ExtCtxt<'_>, span: Span) -> ast::ptr::P<ast::Expr> {
    let default_ident = cx.std_path(&[kw::Default, sym::Default, kw::Default]);