{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
            let norm_ident = Macros20NormalizedIdent::new(ident);
        if ident.name != kw::Underscore && parent == self.r.graph_root {
            if let Some(entry) = self.r.extern_prelude.get(&norm_ident)