mirror of
https://github.com/luau-lang/luau.git
synced 2024-11-15 22:35:43 +08:00
1696 lines
46 KiB
C++
1696 lines
46 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/AstQuery.h"
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#include "Luau/BuiltinDefinitions.h"
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#include "Luau/Error.h"
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#include "Luau/Scope.h"
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#include "Luau/TypeInfer.h"
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#include "Luau/TypeVar.h"
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#include "Luau/VisitTypeVar.h"
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#include "Fixture.h"
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#include "doctest.h"
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using namespace Luau;
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LUAU_FASTFLAG(LuauInstantiateInSubtyping);
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LUAU_FASTFLAG(LuauSpecialTypesAsterisked);
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TEST_SUITE_BEGIN("TypeInferFunctions");
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TEST_CASE_FIXTURE(Fixture, "tc_function")
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{
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CheckResult result = check("function five() return 5 end");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* fiveType = get<FunctionTypeVar>(requireType("five"));
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REQUIRE(fiveType != nullptr);
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}
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TEST_CASE_FIXTURE(Fixture, "check_function_bodies")
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{
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CheckResult result = check("function myFunction() local a = 0 a = true end");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(result.errors[0], (TypeError{Location{Position{0, 44}, Position{0, 48}}, TypeMismatch{
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typeChecker.numberType,
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typeChecker.booleanType,
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}}));
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}
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TEST_CASE_FIXTURE(Fixture, "cannot_hoist_interior_defns_into_signature")
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{
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// This test verifies that the signature does not have access to types
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// declared within the body. Under DCR, if the function's inner scope
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// encompasses the entire function expression, it would be possible for this
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// to type check (but the solver output is somewhat undefined). This test
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// ensures that this isn't the case.
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CheckResult result = check(R"(
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local function f(x: T)
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type T = number
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK(result.errors[0] == TypeError{Location{{1, 28}, {1, 29}}, getMainSourceModule()->name,
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UnknownSymbol{
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"T",
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UnknownSymbol::Context::Type,
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}});
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}
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TEST_CASE_FIXTURE(Fixture, "infer_return_type")
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{
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CheckResult result = check("function take_five() return 5 end");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* takeFiveType = get<FunctionTypeVar>(requireType("take_five"));
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REQUIRE(takeFiveType != nullptr);
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std::vector<TypeId> retVec = flatten(takeFiveType->retTypes).first;
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REQUIRE(!retVec.empty());
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REQUIRE_EQ(*follow(retVec[0]), *typeChecker.numberType);
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}
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TEST_CASE_FIXTURE(Fixture, "infer_from_function_return_type")
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{
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CheckResult result = check("function take_five() return 5 end local five = take_five()");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(*typeChecker.numberType, *follow(requireType("five")));
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}
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TEST_CASE_FIXTURE(Fixture, "infer_that_function_does_not_return_a_table")
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{
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CheckResult result = check(R"(
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function take_five()
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return 5
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end
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take_five().prop = 888
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(result.errors[0], (TypeError{Location{Position{5, 8}, Position{5, 24}}, NotATable{typeChecker.numberType}}));
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}
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TEST_CASE_FIXTURE(Fixture, "vararg_functions_should_allow_calls_of_any_types_and_size")
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{
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CheckResult result = check(R"(
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function f(...) end
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f(1)
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f("foo", 2)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "vararg_function_is_quantified")
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{
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CheckResult result = check(R"(
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local T = {}
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function T.f(...)
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local result = {}
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for i = 1, select("#", ...) do
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local dictionary = select(i, ...)
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for key, value in pairs(dictionary) do
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result[key] = value
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end
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end
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return result
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end
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return T
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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auto r = first(getMainModule()->getModuleScope()->returnType);
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REQUIRE(r);
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TableTypeVar* ttv = getMutable<TableTypeVar>(*r);
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REQUIRE(ttv);
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REQUIRE(ttv->props.count("f"));
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TypeId k = ttv->props["f"].type;
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REQUIRE(k);
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}
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TEST_CASE_FIXTURE(Fixture, "list_only_alternative_overloads_that_match_argument_count")
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{
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CheckResult result = check(R"(
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local multiply: ((number)->number) & ((number)->string) & ((number, number)->number)
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multiply("")
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)");
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LUAU_REQUIRE_ERROR_COUNT(2, result);
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TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
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REQUIRE(tm);
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CHECK_EQ(typeChecker.numberType, tm->wantedType);
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CHECK_EQ(typeChecker.stringType, tm->givenType);
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ExtraInformation* ei = get<ExtraInformation>(result.errors[1]);
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REQUIRE(ei);
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CHECK_EQ("Other overloads are also not viable: (number) -> string", ei->message);
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}
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TEST_CASE_FIXTURE(Fixture, "list_all_overloads_if_no_overload_takes_given_argument_count")
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{
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CheckResult result = check(R"(
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local multiply: ((number)->number) & ((number)->string) & ((number, number)->number)
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multiply()
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)");
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LUAU_REQUIRE_ERROR_COUNT(2, result);
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GenericError* ge = get<GenericError>(result.errors[0]);
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REQUIRE(ge);
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CHECK_EQ("No overload for function accepts 0 arguments.", ge->message);
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ExtraInformation* ei = get<ExtraInformation>(result.errors[1]);
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REQUIRE(ei);
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CHECK_EQ("Available overloads: (number) -> number; (number) -> string; and (number, number) -> number", ei->message);
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}
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TEST_CASE_FIXTURE(Fixture, "dont_give_other_overloads_message_if_only_one_argument_matching_overload_exists")
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{
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CheckResult result = check(R"(
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local multiply: ((number)->number) & ((number)->string) & ((number, number)->number)
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multiply(1, "")
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
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REQUIRE(tm);
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CHECK_EQ(typeChecker.numberType, tm->wantedType);
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CHECK_EQ(typeChecker.stringType, tm->givenType);
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}
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TEST_CASE_FIXTURE(Fixture, "infer_return_type_from_selected_overload")
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{
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CheckResult result = check(R"(
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type T = {method: ((T, number) -> number) & ((number) -> string)}
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local T: T
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local a = T.method(T, 4)
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local b = T.method(5)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number", toString(requireType("a")));
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CHECK_EQ("string", toString(requireType("b")));
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}
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TEST_CASE_FIXTURE(Fixture, "too_many_arguments")
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{
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CheckResult result = check(R"(
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--!nonstrict
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function g(a: number) end
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g()
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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auto err = result.errors[0];
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auto acm = get<CountMismatch>(err);
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REQUIRE(acm);
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CHECK_EQ(1, acm->expected);
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CHECK_EQ(0, acm->actual);
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}
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TEST_CASE_FIXTURE(Fixture, "recursive_function")
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{
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CheckResult result = check(R"(
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function count(n: number)
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if n == 0 then
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return 0
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else
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return count(n - 1)
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "lambda_form_of_local_function_cannot_be_recursive")
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{
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CheckResult result = check(R"(
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local f = function() return f() end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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}
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TEST_CASE_FIXTURE(Fixture, "recursive_local_function")
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{
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CheckResult result = check(R"(
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local function count(n: number)
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if n == 0 then
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return 0
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else
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return count(n - 1)
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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// FIXME: This and the above case get handled very differently. It's pretty dumb.
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// We really should unify the two code paths, probably by deleting AstStatFunction.
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TEST_CASE_FIXTURE(Fixture, "another_recursive_local_function")
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{
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CheckResult result = check(R"(
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local count
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function count(n: number)
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if n == 0 then
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return 0
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else
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return count(n - 1)
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "cyclic_function_type_in_rets")
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{
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CheckResult result = check(R"(
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function f()
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return f
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("t1 where t1 = () -> t1", toString(requireType("f")));
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}
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TEST_CASE_FIXTURE(Fixture, "another_higher_order_function")
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{
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CheckResult result = check(R"(
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local Get_des
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function Get_des(func)
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Get_des(func)
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end
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local function f(d)
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d:IsA("BasePart")
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d.Parent:FindFirstChild("Humanoid")
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d:IsA("Decal")
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end
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Get_des(f)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "another_other_higher_order_function")
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{
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CheckResult result = check(R"(
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local d
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d:foo()
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d:foo()
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "local_function")
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{
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CheckResult result = check(R"(
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function f()
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return 8
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end
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function g()
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local function f()
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return 'hello'
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end
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return f
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end
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local h = g()
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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TypeId h = follow(requireType("h"));
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const FunctionTypeVar* ftv = get<FunctionTypeVar>(h);
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REQUIRE(ftv != nullptr);
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std::optional<TypeId> rt = first(ftv->retTypes);
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REQUIRE(bool(rt));
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TypeId retType = follow(*rt);
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CHECK_EQ(PrimitiveTypeVar::String, getPrimitiveType(retType));
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}
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TEST_CASE_FIXTURE(Fixture, "func_expr_doesnt_leak_free")
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{
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CheckResult result = check(R"(
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local p = function(x) return x end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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const Luau::FunctionTypeVar* fn = get<FunctionTypeVar>(requireType("p"));
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REQUIRE(fn);
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auto ret = first(fn->retTypes);
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REQUIRE(ret);
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REQUIRE(get<GenericTypeVar>(follow(*ret)));
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}
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TEST_CASE_FIXTURE(Fixture, "first_argument_can_be_optional")
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{
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CheckResult result = check(R"(
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local T = {}
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function T.new(a: number?, b: number?, c: number?) return 5 end
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local m = T.new()
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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dumpErrors(result);
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}
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TEST_CASE_FIXTURE(Fixture, "it_is_ok_not_to_supply_enough_retvals")
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{
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CheckResult result = check(R"(
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function get_two() return 5, 6 end
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local a = get_two()
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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dumpErrors(result);
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}
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TEST_CASE_FIXTURE(Fixture, "duplicate_functions2")
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{
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CheckResult result = check(R"(
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function foo() end
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function bar()
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local function foo() end
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(0, result);
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}
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TEST_CASE_FIXTURE(Fixture, "duplicate_functions_allowed_in_nonstrict")
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{
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CheckResult result = check(R"(
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--!nonstrict
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function foo() end
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function foo() end
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function bar()
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local function foo() end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "duplicate_functions_with_different_signatures_not_allowed_in_nonstrict")
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{
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CheckResult result = check(R"(
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--!nonstrict
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function foo(): number
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return 1
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end
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foo()
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function foo(n: number): number
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return 2
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end
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foo()
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
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REQUIRE(tm);
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CHECK_EQ("() -> number", toString(tm->wantedType));
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CHECK_EQ("(number) -> number", toString(tm->givenType));
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}
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TEST_CASE_FIXTURE(Fixture, "complicated_return_types_require_an_explicit_annotation")
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{
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CheckResult result = check(R"(
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local i = 0
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function most_of_the_natural_numbers(): number?
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if i < 10 then
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i = i + 1
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return i
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else
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return nil
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* functionType = get<FunctionTypeVar>(requireType("most_of_the_natural_numbers"));
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std::optional<TypeId> retType = first(functionType->retTypes);
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REQUIRE(retType);
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CHECK(get<UnionTypeVar>(*retType));
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}
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TEST_CASE_FIXTURE(Fixture, "infer_higher_order_function")
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{
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CheckResult result = check(R"(
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function apply(f, x)
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return f(x)
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* ftv = get<FunctionTypeVar>(requireType("apply"));
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REQUIRE(ftv != nullptr);
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std::vector<TypeId> argVec = flatten(ftv->argTypes).first;
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REQUIRE_EQ(2, argVec.size());
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const FunctionTypeVar* fType = get<FunctionTypeVar>(follow(argVec[0]));
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REQUIRE(fType != nullptr);
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std::vector<TypeId> fArgs = flatten(fType->argTypes).first;
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TypeId xType = follow(argVec[1]);
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CHECK_EQ(1, fArgs.size());
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CHECK_EQ(xType, follow(fArgs[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "higher_order_function_2")
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{
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CheckResult result = check(R"(
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function bottomupmerge(comp, a, b, left, mid, right)
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local i, j = left, mid
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for k = left, right do
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if i < mid and (j > right or not comp(a[j], a[i])) then
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b[k] = a[i]
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i = i + 1
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else
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b[k] = a[j]
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j = j + 1
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end
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* ftv = get<FunctionTypeVar>(requireType("bottomupmerge"));
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REQUIRE(ftv != nullptr);
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std::vector<TypeId> argVec = flatten(ftv->argTypes).first;
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REQUIRE_EQ(6, argVec.size());
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const FunctionTypeVar* fType = get<FunctionTypeVar>(follow(argVec[0]));
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REQUIRE(fType != nullptr);
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}
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TEST_CASE_FIXTURE(Fixture, "higher_order_function_3")
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{
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CheckResult result = check(R"(
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function swap(p)
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local t = p[0]
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p[0] = p[1]
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p[1] = t
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return nil
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end
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function swapTwice(p)
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swap(p)
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swap(p)
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return p
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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const FunctionTypeVar* ftv = get<FunctionTypeVar>(requireType("swapTwice"));
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REQUIRE(ftv != nullptr);
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std::vector<TypeId> argVec = flatten(ftv->argTypes).first;
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REQUIRE_EQ(1, argVec.size());
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|
|
const TableTypeVar* argType = get<TableTypeVar>(follow(argVec[0]));
|
|
REQUIRE(argType != nullptr);
|
|
|
|
CHECK(bool(argType->indexer));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "higher_order_function_4")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function bottomupmerge(comp, a, b, left, mid, right)
|
|
local i, j = left, mid
|
|
for k = left, right do
|
|
if i < mid and (j > right or not comp(a[j], a[i])) then
|
|
b[k] = a[i]
|
|
i = i + 1
|
|
else
|
|
b[k] = a[j]
|
|
j = j + 1
|
|
end
|
|
end
|
|
end
|
|
|
|
function mergesort(arr, comp)
|
|
local work = {}
|
|
for i = 1, #arr do
|
|
work[i] = arr[i]
|
|
end
|
|
local width = 1
|
|
while width < #arr do
|
|
for i = 1, #arr, 2*width do
|
|
bottomupmerge(comp, arr, work, i, math.min(i+width, #arr), math.min(i+2*width-1, #arr))
|
|
end
|
|
local temp = work
|
|
work = arr
|
|
arr = temp
|
|
width = width * 2
|
|
end
|
|
return arr
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
dumpErrors(result);
|
|
|
|
/*
|
|
* mergesort takes two arguments: an array of some type T and a function that takes two Ts.
|
|
* We must assert that these two types are in fact the same type.
|
|
* In other words, comp(arr[x], arr[y]) is well-typed.
|
|
*/
|
|
|
|
const FunctionTypeVar* ftv = get<FunctionTypeVar>(requireType("mergesort"));
|
|
REQUIRE(ftv != nullptr);
|
|
|
|
std::vector<TypeId> argVec = flatten(ftv->argTypes).first;
|
|
|
|
REQUIRE_EQ(2, argVec.size());
|
|
|
|
const TableTypeVar* arg0 = get<TableTypeVar>(follow(argVec[0]));
|
|
REQUIRE(arg0 != nullptr);
|
|
REQUIRE(bool(arg0->indexer));
|
|
|
|
const FunctionTypeVar* arg1 = get<FunctionTypeVar>(follow(argVec[1]));
|
|
REQUIRE(arg1 != nullptr);
|
|
REQUIRE_EQ(2, size(arg1->argTypes));
|
|
|
|
std::vector<TypeId> arg1Args = flatten(arg1->argTypes).first;
|
|
|
|
CHECK_EQ(*arg0->indexer->indexResultType, *arg1Args[0]);
|
|
CHECK_EQ(*arg0->indexer->indexResultType, *arg1Args[1]);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "mutual_recursion")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
function newPlayerCharacter()
|
|
startGui() -- Unknown symbol 'startGui'
|
|
end
|
|
|
|
local characterAddedConnection: any
|
|
function startGui()
|
|
characterAddedConnection = game:GetService("Players").LocalPlayer.CharacterAdded:connect(newPlayerCharacter)
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
dumpErrors(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "toposort_doesnt_break_mutual_recursion")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
local x = nil
|
|
function f() g() end
|
|
-- make sure print(x) doesn't get toposorted here, breaking the mutual block
|
|
function g() x = f end
|
|
print(x)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
dumpErrors(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "check_function_before_lambda_that_uses_it")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
|
|
function f()
|
|
return 114
|
|
end
|
|
|
|
return function()
|
|
return f():andThen()
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "it_is_ok_to_oversaturate_a_higher_order_function_argument")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function onerror() end
|
|
function foo() end
|
|
xpcall(foo, onerror)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "another_indirect_function_case_where_it_is_ok_to_provide_too_many_arguments")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local mycb: (number, number) -> ()
|
|
|
|
function f() end
|
|
|
|
mycb = f
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "report_exiting_without_return_nonstrict")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
|
|
local function f1(v): number?
|
|
if v then
|
|
return 1
|
|
end
|
|
end
|
|
|
|
local function f2(v)
|
|
if v then
|
|
return 1
|
|
end
|
|
end
|
|
|
|
local function f3(v): ()
|
|
if v then
|
|
return
|
|
end
|
|
end
|
|
|
|
local function f4(v)
|
|
if v then
|
|
return
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
FunctionExitsWithoutReturning* err = get<FunctionExitsWithoutReturning>(result.errors[0]);
|
|
CHECK(err);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "report_exiting_without_return_strict")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
local function f1(v): number?
|
|
if v then
|
|
return 1
|
|
end
|
|
end
|
|
|
|
local function f2(v)
|
|
if v then
|
|
return 1
|
|
end
|
|
end
|
|
|
|
local function f3(v): ()
|
|
if v then
|
|
return
|
|
end
|
|
end
|
|
|
|
local function f4(v)
|
|
if v then
|
|
return
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
FunctionExitsWithoutReturning* annotatedErr = get<FunctionExitsWithoutReturning>(result.errors[0]);
|
|
CHECK(annotatedErr);
|
|
|
|
FunctionExitsWithoutReturning* inferredErr = get<FunctionExitsWithoutReturning>(result.errors[1]);
|
|
CHECK(inferredErr);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "calling_function_with_incorrect_argument_type_yields_errors_spanning_argument")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function foo(a: number, b: string) end
|
|
|
|
foo("Test", 123)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
|
|
CHECK_EQ(result.errors[0], (TypeError{Location{Position{3, 12}, Position{3, 18}}, TypeMismatch{
|
|
typeChecker.numberType,
|
|
typeChecker.stringType,
|
|
}}));
|
|
|
|
CHECK_EQ(result.errors[1], (TypeError{Location{Position{3, 20}, Position{3, 23}}, TypeMismatch{
|
|
typeChecker.stringType,
|
|
typeChecker.numberType,
|
|
}}));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "calling_function_with_anytypepack_doesnt_leak_free_types")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
|
|
function Test(a)
|
|
return 1, ""
|
|
end
|
|
|
|
|
|
local tab = {}
|
|
table.insert(tab, Test(1));
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
ToStringOptions opts;
|
|
opts.exhaustive = true;
|
|
opts.maxTableLength = 0;
|
|
|
|
CHECK_EQ("{any}", toString(requireType("tab"), opts));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "too_many_return_values")
|
|
{
|
|
ScopedFastFlag sff{"LuauBetterMessagingOnCountMismatch", true};
|
|
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
function f()
|
|
return 55
|
|
end
|
|
|
|
local a, b = f()
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CountMismatch* acm = get<CountMismatch>(result.errors[0]);
|
|
REQUIRE(acm);
|
|
CHECK_EQ(acm->context, CountMismatch::FunctionResult);
|
|
CHECK_EQ(acm->expected, 1);
|
|
CHECK_EQ(acm->actual, 2);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "too_many_return_values_in_parentheses")
|
|
{
|
|
ScopedFastFlag sff{"LuauBetterMessagingOnCountMismatch", true};
|
|
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
function f()
|
|
return 55
|
|
end
|
|
|
|
local a, b = (f())
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CountMismatch* acm = get<CountMismatch>(result.errors[0]);
|
|
REQUIRE(acm);
|
|
CHECK_EQ(acm->context, CountMismatch::FunctionResult);
|
|
CHECK_EQ(acm->expected, 1);
|
|
CHECK_EQ(acm->actual, 2);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "too_many_return_values_no_function")
|
|
{
|
|
ScopedFastFlag sff{"LuauBetterMessagingOnCountMismatch", true};
|
|
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
local a, b = 55
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CountMismatch* acm = get<CountMismatch>(result.errors[0]);
|
|
REQUIRE(acm);
|
|
CHECK_EQ(acm->context, CountMismatch::ExprListResult);
|
|
CHECK_EQ(acm->expected, 1);
|
|
CHECK_EQ(acm->actual, 2);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "ignored_return_values")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
function f()
|
|
return 55, ""
|
|
end
|
|
|
|
local a = f()
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(0, result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "function_does_not_return_enough_values")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
function f(): (number, string)
|
|
return 55
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CountMismatch* acm = get<CountMismatch>(result.errors[0]);
|
|
REQUIRE(acm);
|
|
CHECK_EQ(acm->context, CountMismatch::Return);
|
|
CHECK_EQ(acm->expected, 2);
|
|
CHECK_EQ(acm->actual, 1);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "function_cast_error_uses_correct_language")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function foo(a, b): number
|
|
return 0
|
|
end
|
|
|
|
local a: (string)->number = foo
|
|
local b: (number, number)->(number, number) = foo
|
|
|
|
local c: (string, number)->number = foo -- no error
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
|
|
auto tm1 = get<TypeMismatch>(result.errors[0]);
|
|
REQUIRE(tm1);
|
|
|
|
CHECK_EQ("(string) -> number", toString(tm1->wantedType));
|
|
if (FFlag::LuauSpecialTypesAsterisked)
|
|
CHECK_EQ("(string, *error-type*) -> number", toString(tm1->givenType));
|
|
else
|
|
CHECK_EQ("(string, <error-type>) -> number", toString(tm1->givenType));
|
|
|
|
auto tm2 = get<TypeMismatch>(result.errors[1]);
|
|
REQUIRE(tm2);
|
|
|
|
CHECK_EQ("(number, number) -> (number, number)", toString(tm2->wantedType));
|
|
if (FFlag::LuauSpecialTypesAsterisked)
|
|
CHECK_EQ("(string, *error-type*) -> number", toString(tm2->givenType));
|
|
else
|
|
CHECK_EQ("(string, <error-type>) -> number", toString(tm2->givenType));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "no_lossy_function_type")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
local tbl = {}
|
|
function tbl:abc(a: number, b: number)
|
|
return a
|
|
end
|
|
tbl:abc(1, 2) -- Line 6
|
|
-- | Column 14
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
TypeId type = requireTypeAtPosition(Position(6, 14));
|
|
CHECK_EQ("(tbl, number, number) -> number", toString(type));
|
|
auto ftv = get<FunctionTypeVar>(type);
|
|
REQUIRE(ftv);
|
|
CHECK(ftv->hasSelf);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "record_matching_overload")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type Overload = ((string) -> string) & ((number) -> number)
|
|
local abc: Overload
|
|
abc(1)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// AstExprCall is the node that has the overload stored on it.
|
|
// findTypeAtPosition will look at the AstExprLocal, but this is not what
|
|
// we want to look at.
|
|
std::vector<AstNode*> ancestry = findAstAncestryOfPosition(*getMainSourceModule(), Position(3, 10));
|
|
REQUIRE_GE(ancestry.size(), 2);
|
|
AstExpr* parentExpr = ancestry[ancestry.size() - 2]->asExpr();
|
|
REQUIRE(bool(parentExpr));
|
|
REQUIRE(parentExpr->is<AstExprCall>());
|
|
|
|
ModulePtr module = getMainModule();
|
|
auto it = module->astOverloadResolvedTypes.find(parentExpr);
|
|
REQUIRE(it);
|
|
CHECK_EQ(toString(*it), "(number) -> number");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "return_type_by_overload")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type Overload = ((string) -> string) & ((number, number) -> number)
|
|
local abc: Overload
|
|
local x = abc(true)
|
|
local y = abc(true,true)
|
|
local z = abc(true,true,true)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
CHECK_EQ("string", toString(requireType("x")));
|
|
CHECK_EQ("number", toString(requireType("y")));
|
|
// Should this be string|number?
|
|
CHECK_EQ("string", toString(requireType("z")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "infer_anonymous_function_arguments")
|
|
{
|
|
// Simple direct arg to arg propagation
|
|
CheckResult result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: (Table) -> number) return a({x = 1, y = 2}) end
|
|
f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// An optional function is accepted, but since we already provide a function, nil can be ignored
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: ((Table) -> number)?) if a then return a({x = 1, y = 2}) else return 0 end end
|
|
f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Make sure self calls match correct index
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local x = {}
|
|
x.b = {x = 1, y = 2}
|
|
function x:f(a: (Table) -> number) return a(self.b) end
|
|
x:f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Mix inferred and explicit argument types
|
|
result = check(R"(
|
|
function f(a: (a: number, b: number, c: boolean) -> number) return a(1, 2, true) end
|
|
f(function(a: number, b, c) return c and a + b or b - a end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Anonymous function has a variadic pack
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: (Table) -> number) return a({x = 1, y = 2}) end
|
|
f(function(...) return select(1, ...).z end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
CHECK_EQ("Key 'z' not found in table 'Table'", toString(result.errors[0]));
|
|
|
|
// Can't accept more arguments than provided
|
|
result = check(R"(
|
|
function f(a: (a: number, b: number) -> number) return a(1, 2) end
|
|
f(function(a, b, c, ...) return a + b end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
|
|
if (FFlag::LuauInstantiateInSubtyping)
|
|
{
|
|
CHECK_EQ(R"(Type '<a>(number, number, a) -> number' could not be converted into '(number, number) -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 3 arguments, but only 2 are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
else
|
|
{
|
|
CHECK_EQ(R"(Type '(number, number, a) -> number' could not be converted into '(number, number) -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 3 arguments, but only 2 are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
|
|
// Infer from variadic packs into elements
|
|
result = check(R"(
|
|
function f(a: (...number) -> number) return a(1, 2) end
|
|
f(function(a, b) return a + b end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Infer from variadic packs into variadic packs
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
function f(a: (...Table) -> number) return a({x = 1, y = 2}, {x = 3, y = 4}) end
|
|
f(function(a, ...) local b = ... return b.z end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
CHECK_EQ("Key 'z' not found in table 'Table'", toString(result.errors[0]));
|
|
|
|
// Return type inference
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
function f(a: (number) -> Table) return a(4) end
|
|
f(function(x) return x * 2 end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ("Type 'number' could not be converted into 'Table'", toString(result.errors[0]));
|
|
|
|
// Return type doesn't inference 'nil'
|
|
result = check(R"(
|
|
function f(a: (number) -> nil) return a(4) end
|
|
f(function(x) print(x) end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "infer_anonymous_function_arguments")
|
|
{
|
|
// Simple direct arg to arg propagation
|
|
CheckResult result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: (Table) -> number) return a({x = 1, y = 2}) end
|
|
f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// An optional function is accepted, but since we already provide a function, nil can be ignored
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: ((Table) -> number)?) if a then return a({x = 1, y = 2}) else return 0 end end
|
|
f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Make sure self calls match correct index
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local x = {}
|
|
x.b = {x = 1, y = 2}
|
|
function x:f(a: (Table) -> number) return a(self.b) end
|
|
x:f(function(a) return a.x + a.y end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Mix inferred and explicit argument types
|
|
result = check(R"(
|
|
function f(a: (a: number, b: number, c: boolean) -> number) return a(1, 2, true) end
|
|
f(function(a: number, b, c) return c and a + b or b - a end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Anonymous function has a variadic pack
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local function f(a: (Table) -> number) return a({x = 1, y = 2}) end
|
|
f(function(...) return select(1, ...).z end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
CHECK_EQ("Key 'z' not found in table 'Table'", toString(result.errors[0]));
|
|
|
|
// Can't accept more arguments than provided
|
|
result = check(R"(
|
|
function f(a: (a: number, b: number) -> number) return a(1, 2) end
|
|
f(function(a, b, c, ...) return a + b end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
|
|
if (FFlag::LuauInstantiateInSubtyping)
|
|
{
|
|
CHECK_EQ(R"(Type '<a>(number, number, a) -> number' could not be converted into '(number, number) -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 3 arguments, but only 2 are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
else
|
|
{
|
|
CHECK_EQ(R"(Type '(number, number, a) -> number' could not be converted into '(number, number) -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 3 arguments, but only 2 are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
|
|
// Infer from variadic packs into elements
|
|
result = check(R"(
|
|
function f(a: (...number) -> number) return a(1, 2) end
|
|
f(function(a, b) return a + b end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// Infer from variadic packs into variadic packs
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
function f(a: (...Table) -> number) return a({x = 1, y = 2}, {x = 3, y = 4}) end
|
|
f(function(a, ...) local b = ... return b.z end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
CHECK_EQ("Key 'z' not found in table 'Table'", toString(result.errors[0]));
|
|
|
|
// Return type inference
|
|
result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
function f(a: (number) -> Table) return a(4) end
|
|
f(function(x) return x * 2 end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ("Type 'number' could not be converted into 'Table'", toString(result.errors[0]));
|
|
|
|
// Return type doesn't inference 'nil'
|
|
result = check(R"(
|
|
function f(a: (number) -> nil) return a(4) end
|
|
f(function(x) print(x) end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "infer_anonymous_function_arguments_outside_call")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type Table = { x: number, y: number }
|
|
local f: (Table) -> number = function(t) return t.x + t.y end
|
|
|
|
type TableWithFunc = { x: number, y: number, f: (number, number) -> number }
|
|
local a: TableWithFunc = { x = 3, y = 4, f = function(a, b) return a + b end }
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "infer_return_value_type")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(): {string|number}
|
|
return {1, "b", 3}
|
|
end
|
|
|
|
local function g(): (number, {string|number})
|
|
return 4, {1, "b", 3}
|
|
end
|
|
|
|
local function h(): ...{string|number}
|
|
return {4}, {1, "b", 3}, {"s"}
|
|
end
|
|
|
|
local function i(): ...{string|number}
|
|
return {1, "b", 3}, h()
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_arg_count")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type A = (number, number) -> string
|
|
type B = (number) -> string
|
|
|
|
local a: A
|
|
local b: B = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type '(number, number) -> string' could not be converted into '(number) -> string'
|
|
caused by:
|
|
Argument count mismatch. Function expects 2 arguments, but only 1 is specified)");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_arg")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type A = (number, number) -> string
|
|
type B = (number, string) -> string
|
|
|
|
local a: A
|
|
local b: B = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type '(number, number) -> string' could not be converted into '(number, string) -> string'
|
|
caused by:
|
|
Argument #2 type is not compatible. Type 'string' could not be converted into 'number')");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_ret_count")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type A = (number, number) -> (number)
|
|
type B = (number, number) -> (number, boolean)
|
|
|
|
local a: A
|
|
local b: B = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type '(number, number) -> number' could not be converted into '(number, number) -> (number, boolean)'
|
|
caused by:
|
|
Function only returns 1 value, but 2 are required here)");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_ret")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type A = (number, number) -> string
|
|
type B = (number, number) -> number
|
|
|
|
local a: A
|
|
local b: B = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type '(number, number) -> string' could not be converted into '(number, number) -> number'
|
|
caused by:
|
|
Return type is not compatible. Type 'string' could not be converted into 'number')");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_ret_mult")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type A = (number, number) -> (number, string)
|
|
type B = (number, number) -> (number, boolean)
|
|
|
|
local a: A
|
|
local b: B = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
R"(Type '(number, number) -> (number, string)' could not be converted into '(number, number) -> (number, boolean)'
|
|
caused by:
|
|
Return #2 type is not compatible. Type 'string' could not be converted into 'boolean')");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "function_decl_quantify_right_type")
|
|
{
|
|
fileResolver.source["game/isAMagicMock"] = R"(
|
|
--!nonstrict
|
|
return function(value)
|
|
return false
|
|
end
|
|
)";
|
|
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
local MagicMock = {}
|
|
MagicMock.is = require(game.isAMagicMock)
|
|
|
|
function MagicMock.is(value)
|
|
return false
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "function_decl_non_self_sealed_overwrite")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function string.len(): number
|
|
return 1
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
// if 'string' library property was replaced with an internal module type, it will be freed and the next check will crash
|
|
frontend.clear();
|
|
|
|
result = check(R"(
|
|
print(string.len('hello'))
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "function_decl_non_self_sealed_overwrite_2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t: { f: ((x: number) -> number)? } = {}
|
|
|
|
function t.f(x)
|
|
print(x + 5)
|
|
return x .. "asd" -- 1st error: we know that return type is a number, not a string
|
|
end
|
|
|
|
t.f = function(x)
|
|
print(x + 5)
|
|
return x .. "asd" -- 2nd error: we know that return type is a number, not a string
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type 'string' could not be converted into 'number')");
|
|
CHECK_EQ(toString(result.errors[1]), R"(Type 'string' could not be converted into 'number')");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "inferred_higher_order_functions_are_quantified_at_the_right_time2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!strict
|
|
|
|
local function resolveDispatcher()
|
|
return (nil :: any) :: {useContext: (number?) -> any}
|
|
end
|
|
|
|
local useContext
|
|
useContext = function(unstable_observedBits: number?)
|
|
resolveDispatcher().useContext(unstable_observedBits)
|
|
end
|
|
)");
|
|
|
|
// LUAU_REQUIRE_NO_ERRORS is particularly unhelpful when this test is broken.
|
|
// You get a TypeMismatch error where both types stringify the same.
|
|
|
|
CHECK(result.errors.empty());
|
|
if (!result.errors.empty())
|
|
{
|
|
for (const auto& e : result.errors)
|
|
printf("%s %s: %s\n", e.moduleName.c_str(), toString(e.location).c_str(), toString(e).c_str());
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "inferred_higher_order_functions_are_quantified_at_the_right_time3")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local foo
|
|
|
|
foo():bar(function()
|
|
return foo()
|
|
end)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "function_decl_non_self_unsealed_overwrite")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t = { f = nil :: ((x: number) -> number)? }
|
|
|
|
function t.f(x: string): string -- 1st error: new function value type is incompatible
|
|
return x .. "asd"
|
|
end
|
|
|
|
t.f = function(x)
|
|
print(x + 5)
|
|
return x .. "asd" -- 2nd error: we know that return type is a number, not a string
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
CHECK_EQ(toString(result.errors[0]), R"(Type '(string) -> string' could not be converted into '((number) -> number)?'
|
|
caused by:
|
|
None of the union options are compatible. For example: Type '(string) -> string' could not be converted into '(number) -> number'
|
|
caused by:
|
|
Argument #1 type is not compatible. Type 'number' could not be converted into 'string')");
|
|
CHECK_EQ(toString(result.errors[1]), R"(Type 'string' could not be converted into 'number')");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "strict_mode_ok_with_missing_arguments")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: any) end
|
|
f()
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "function_statement_sealed_table_assignment_through_indexer")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t: {[string]: () -> number} = {}
|
|
|
|
function t.a() return 1 end -- OK
|
|
function t:b() return 2 end -- not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
if (FFlag::LuauSpecialTypesAsterisked)
|
|
{
|
|
CHECK_EQ(R"(Type '(*error-type*) -> number' could not be converted into '() -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 1 argument, but none are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
else
|
|
{
|
|
CHECK_EQ(R"(Type '(<error-type>) -> number' could not be converted into '() -> number'
|
|
caused by:
|
|
Argument count mismatch. Function expects 1 argument, but none are specified)",
|
|
toString(result.errors[0]));
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "too_few_arguments_variadic")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function test(a: number, b: string, ...)
|
|
end
|
|
|
|
test(1)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
auto err = result.errors[0];
|
|
auto acm = get<CountMismatch>(err);
|
|
REQUIRE(acm);
|
|
|
|
CHECK_EQ(2, acm->expected);
|
|
CHECK_EQ(1, acm->actual);
|
|
CHECK_EQ(CountMismatch::Context::Arg, acm->context);
|
|
CHECK(acm->isVariadic);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "too_few_arguments_variadic_generic")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function test(a: number, b: string, ...)
|
|
return 1
|
|
end
|
|
|
|
function wrapper<A...>(f: (A...) -> number, ...: A...)
|
|
end
|
|
|
|
wrapper(test)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
auto err = result.errors[0];
|
|
auto acm = get<CountMismatch>(err);
|
|
REQUIRE(acm);
|
|
|
|
CHECK_EQ(3, acm->expected);
|
|
CHECK_EQ(1, acm->actual);
|
|
CHECK_EQ(CountMismatch::Context::Arg, acm->context);
|
|
CHECK(acm->isVariadic);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "too_few_arguments_variadic_generic2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function test(a: number, b: string, ...)
|
|
return 1
|
|
end
|
|
|
|
function wrapper<A...>(f: (A...) -> number, ...: A...)
|
|
end
|
|
|
|
pcall(wrapper, test)
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
auto err = result.errors[0];
|
|
auto acm = get<CountMismatch>(err);
|
|
REQUIRE(acm);
|
|
|
|
CHECK_EQ(4, acm->expected);
|
|
CHECK_EQ(2, acm->actual);
|
|
CHECK_EQ(CountMismatch::Context::Arg, acm->context);
|
|
CHECK(acm->isVariadic);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "occurs_check_failure_in_function_return_type")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f()
|
|
return 5, f()
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CHECK(nullptr != get<OccursCheckFailed>(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "free_is_not_bound_to_unknown")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function foo(f: (unknown) -> (), x)
|
|
f(x)
|
|
end
|
|
)");
|
|
|
|
CHECK_EQ("<a>((unknown) -> (), a) -> ()", toString(requireType("foo")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "dont_infer_parameter_types_for_functions_from_their_call_site")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t = {}
|
|
|
|
function t.f(x)
|
|
return x
|
|
end
|
|
|
|
t.__index = t
|
|
|
|
function g(s)
|
|
local q = s.p and s.p.q or nil
|
|
return q and t.f(q) or nil
|
|
end
|
|
|
|
local f = t.f
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("<a>(a) -> a", toString(requireType("f")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "dont_mutate_the_underlying_head_of_typepack_when_calling_with_self")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t = {}
|
|
function t:m(x) end
|
|
function f(): never return 5 :: never end
|
|
t:m(f())
|
|
t:m(f())
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "improved_function_arg_mismatch_errors")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function foo1(a: number) end
|
|
foo1()
|
|
|
|
local function foo2(a: number, b: string?) end
|
|
foo2()
|
|
|
|
local function foo3(a: number, b: string?, c: any) end -- any is optional
|
|
foo3()
|
|
|
|
string.find()
|
|
|
|
local t = {}
|
|
function t.foo(x: number, y: string?, ...: any) end
|
|
function t:bar(x: number, y: string?) end
|
|
t.foo()
|
|
|
|
t:bar()
|
|
|
|
local u = { a = t }
|
|
u.a.foo()
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(7, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Argument count mismatch. Function 'foo1' expects 1 argument, but none are specified");
|
|
CHECK_EQ(toString(result.errors[1]), "Argument count mismatch. Function 'foo2' expects 1 to 2 arguments, but none are specified");
|
|
CHECK_EQ(toString(result.errors[2]), "Argument count mismatch. Function 'foo3' expects 1 to 3 arguments, but none are specified");
|
|
CHECK_EQ(toString(result.errors[3]), "Argument count mismatch. Function 'string.find' expects 2 to 4 arguments, but none are specified");
|
|
CHECK_EQ(toString(result.errors[4]), "Argument count mismatch. Function 't.foo' expects at least 1 argument, but none are specified");
|
|
CHECK_EQ(toString(result.errors[5]), "Argument count mismatch. Function 't.bar' expects 2 to 3 arguments, but only 1 is specified");
|
|
CHECK_EQ(toString(result.errors[6]), "Argument count mismatch. Function 'u.a.foo' expects at least 1 argument, but none are specified");
|
|
}
|
|
|
|
// This might be surprising, but since 'any' became optional, unannotated functions in non-strict 'expect' 0 arguments
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "improved_function_arg_mismatch_error_nonstrict")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
local function foo(a, b) end
|
|
foo(string.find("hello", "e"))
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Argument count mismatch. Function 'foo' expects 0 to 2 arguments, but 3 are specified");
|
|
}
|
|
|
|
TEST_SUITE_END();
|