         return Query(form: .ask, algebra: ggp, dataset: dataset)
     }
 
-    private mutating func parseDatasetClauses() throws -> Dataset? { // TODO: figure out the return type here
+    private mutating func parseDatasetClauses() throws -> Dataset? {
         var named = [Term]()
         var unnamed = [Term]()
         while try attempt(token: .keyword("FROM")) {

        } else {
            let t = try peekExpectedToken()
            if case .lang(let lang) = t {
                return .bound(Term(value: value, type: .language(lang)))
            }
        }

                }
                try expect(token: .rparen)
            }
            // TODO: parse built-in functions into native Expression enum cases, not generic .call(_)s
            return .call(kw, args)
        default:
            throw parseError("Expected built-in function call but found \(t)")
