{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":".hir_parent_iter(constraint.hir_id)"}]}
                        .hir_parent_iter(constraint.hir_id)
                    let impl_block = tcx
                        .find_map(|(_, node)| node.impl_block_of_trait(def_id));