{"ast_node_type":"variable","tokens":[{"end":24,"kind":"keyword","start":0,"text":"let"}]}
                let ty =
                    .map_bound(|alias| tcx.type_of(alias.def_id).instantiate(tcx, alias.args));
                    check_assoc_const_binding_type(self, constraint.ident, ty, constraint.hir_id);