{"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(impl_def_id) = impl_def_id.as_local() {
    pub fn span_of_impl(self, impl_def_id: DefId) -> Result<Span, Symbol> {
            Ok(self.def_span(impl_def_id))