{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"errors_buffer.push(RegionErrorKind::UnexpectedHiddenRegion"}]}
            errors_buffer.push(RegionErrorKind::UnexpectedHiddenRegion {
            let member_region = ty::Region::new_var(infcx.tcx, member_region_vid);
                span: m_c.definition_span,