{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"Err(ConstParamTyImplementationError::InvalidInnerTyOfBuiltinTy(infringing_tys))"}]}
        Err(ConstParamTyImplementationError::InvalidInnerTyOfBuiltinTy(infringing_tys)) => {
        }
            let span = tcx.hir_expect_item(impl_did).expect_impl().self_ty.span;