{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"return"}]}
                return Err(self.dcx().emit_err(crate::errors::ReturnTypeNotationEqualityBound {
            hir::AssocItemConstraintKind::Equality { .. } if let ty::AssocTag::Fn = assoc_tag => {
                    span: constraint.span,