{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
        // Lower outside new scope to preserve `is_in_loop_condition`.
        let bound_generic_params = self.lower_lifetime_binder(closure_id, generic_params);
        let fn_decl = self.lower_fn_decl(decl, closure_id, fn_decl_span, FnDeclKind::Closure, None);