{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
        // convert to the ExternAbi that *shares a string* with this CanonAbi.
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        // FIXME: ideally we'd avoid printing `CanonAbi`, and preserve `ExternAbi` everywhere