{"ast_node_type":"function","tokens":[{"end":63,"kind":"keyword","start":0,"text":"pub(crate)"}]}
    pub(crate) fn err_ctxt(&'a self) -> TypeErrCtxt<'a, 'tcx> {
    /// [`InferCtxtErrorExt::err_ctxt`]: rustc_trait_selection::error_reporting::InferCtxtErrorExt::err_ctxt
        let mut sub_relations = SubRelations::default();