mirror of
https://github.com/luau-lang/luau.git
synced 2024-12-13 21:40:43 +00:00
839 lines
21 KiB
C++
839 lines
21 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/TypeInfer.h"
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#include "Luau/Type.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(DebugLuauDeferredConstraintResolution);
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TEST_SUITE_BEGIN("UnionTypes");
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TEST_CASE_FIXTURE(Fixture, "return_types_can_be_disjoint")
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{
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CheckResult result = check(R"(
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local count = 0
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function most_of_the_natural_numbers(): number?
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if count < 10 then
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count = count + 1
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return count
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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 FunctionType* utv = get<FunctionType>(requireType("most_of_the_natural_numbers"));
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REQUIRE(utv != nullptr);
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}
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TEST_CASE_FIXTURE(Fixture, "allow_specific_assign")
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{
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CheckResult result = check(R"(
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local a:number|string = 22
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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, "allow_more_specific_assign")
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{
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CheckResult result = check(R"(
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local a:number|string = 22
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local b:number|string|nil = a
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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, "disallow_less_specific_assign")
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{
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CheckResult result = check(R"(
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local a:number = 10
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local b:number|string = 20
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a = b
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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, "disallow_less_specific_assign2")
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{
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CheckResult result = check(R"(
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local a:number? = 10
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local b:number|string? = 20
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a = b
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)");
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REQUIRE_EQ(1, result.errors.size());
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}
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TEST_CASE_FIXTURE(Fixture, "optional_arguments")
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{
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CheckResult result = check(R"(
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function f(a:string, b:string?)
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end
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f("s")
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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, "optional_arguments_table")
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{
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CheckResult result = check(R"(
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local a:{a:string, b:string?}
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a = {a="ok"}
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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, "optional_arguments_table2")
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{
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CheckResult result = check(R"(
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local a:{a:string, b:string}
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a = {a=""}
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)");
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REQUIRE(!result.errors.empty());
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "error_takes_optional_arguments")
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{
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CheckResult result = check(R"(
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error("message")
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error("message", 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(Fixture, "error_optional_argument_enforces_type")
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{
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CheckResult result = check(R"(
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error("message", "2")
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)");
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REQUIRE(result.errors.size() == 1);
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_with_property_guaranteed_to_exist")
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{
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CheckResult result = check(R"(
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type A = {x: number}
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type B = {x: number}
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local t: A | B
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local r = t.x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(*builtinTypes->numberType, *requireType("r"));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_with_mixed_types")
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{
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CheckResult result = check(R"(
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type A = {x: number}
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type B = {x: string}
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local t: A | B
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local r = t.x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number | string", toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_works_at_arbitrary_depth")
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{
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CheckResult result = check(R"(
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type A = {x: {y: {z: {thing: number}}}}
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type B = {x: {y: {z: {thing: string}}}}
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local t: A | B
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local r = t.x.y.z.thing
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number | string", toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_with_one_optional_property")
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{
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CheckResult result = check(R"(
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type A = {x: number}
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type B = {x: number?}
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local t: A | B
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local r = t.x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number?", toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_with_missing_property")
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{
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CheckResult result = check(R"(
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type A = {x: number}
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type B = {}
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local t: A | B
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local r = t.x
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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MissingUnionProperty* mup = get<MissingUnionProperty>(result.errors[0]);
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REQUIRE(mup);
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CHECK_EQ(mup->type, requireType("t"));
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REQUIRE(mup->missing.size() == 1);
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std::optional<TypeId> bTy = lookupType("B");
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REQUIRE(bTy);
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CHECK_EQ(mup->missing[0], *bTy);
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CHECK_EQ(mup->key, "x");
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CHECK_EQ("*error-type*", toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_union_type_with_one_property_of_type_any")
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{
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CheckResult result = check(R"(
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type A = {x: number}
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type B = {x: any}
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local t: A | B
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local r = t.x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(*builtinTypes->anyType, *requireType("r"));
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}
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TEST_CASE_FIXTURE(Fixture, "union_equality_comparisons")
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{
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CheckResult result = check(R"(
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type A = number | string | nil
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type B = number | nil
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type C = number | boolean
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local a: A = 1
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local b: B = nil
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local c: C = true
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local n = 1
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local x = a == b
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local y = a == n
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local z = a == c
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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, "optional_union_members")
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{
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CheckResult result = check(R"(
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local a = { a = { x = 1, y = 2 }, b = 3 }
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type A = typeof(a)
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local b: A? = a
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local bf = b
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local c = bf.a.y
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(*builtinTypes->numberType, *requireType("c"));
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_union_functions")
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{
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CheckResult result = check(R"(
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local a = {}
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function a.foo(x:number, y:number) return x + y end
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type A = typeof(a)
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local b: A? = a
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local c = b.foo(1, 2)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(*builtinTypes->numberType, *requireType("c"));
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_union_methods")
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{
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CheckResult result = check(R"(
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local a = {}
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function a:foo(x:number, y:number) return x + y end
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type A = typeof(a)
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local b: A? = a
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local c = b:foo(1, 2)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(*builtinTypes->numberType, *requireType("c"));
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_union_follow")
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{
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CheckResult result = check(R"(
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local y: number? = 2
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local x = y
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local function f(a: number, b: typeof(x), c: typeof(x)) return -a end
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return f()
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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auto acm = get<CountMismatch>(result.errors[0]);
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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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CHECK_FALSE(acm->isVariadic);
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}
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TEST_CASE_FIXTURE(Fixture, "optional_field_access_error")
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{
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CheckResult result = check(R"(
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type A = { x: number }
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local b: A? = { x = 2 }
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local c = b.x
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local d = b.y
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)");
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LUAU_REQUIRE_ERROR_COUNT(3, result);
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[1]));
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CHECK_EQ("Key 'y' not found in table 'A'", toString(result.errors[2]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_index_error")
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{
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CheckResult result = check(R"(
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type A = {number}
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local a: A? = {1, 2, 3}
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local b = a[1]
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_call_error")
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{
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CheckResult result = check(R"(
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type A = (number) -> number
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local a: A? = function(a) return -a end
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local b = a(4)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Value of type '((number) -> number)?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_assignment_errors")
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{
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CheckResult result = check(R"(
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type A = { x: number }
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local a: A? = { x = 2 }
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a.x = 2
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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result = check(R"(
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type A = { x: number } & { y: number }
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local a: A? = { x = 2, y = 3 }
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a.x = 2
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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auto s = toString(result.errors[0]);
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CHECK_EQ("Value of type '({| x: number |} & {| y: number |})?' could be nil", s);
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}
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TEST_CASE_FIXTURE(Fixture, "optional_length_error")
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{
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CheckResult result = check(R"(
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type A = {number}
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local a: A? = {1, 2, 3}
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local b = #a
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Value of type 'A?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_missing_key_error_details")
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{
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CheckResult result = check(R"(
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type A = { x: number, y: number }
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type B = { x: number, y: number }
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type C = { x: number }
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type D = { x: number }
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local a: A|B|C|D
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local b = a.y
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local c: A|(B|C)?|D
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local d = c.y
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local e = a.z
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)");
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LUAU_REQUIRE_ERROR_COUNT(4, result);
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CHECK_EQ("Key 'y' is missing from 'C', 'D' in the type 'A | B | C | D'", toString(result.errors[0]));
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CHECK_EQ("Value of type '(A | B | C | D)?' could be nil", toString(result.errors[1]));
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CHECK_EQ("Key 'y' is missing from 'C', 'D' in the type 'A | B | C | D'", toString(result.errors[2]));
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CHECK_EQ("Type 'A | B | C | D' does not have key 'z'", toString(result.errors[3]));
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}
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TEST_CASE_FIXTURE(Fixture, "optional_iteration")
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{
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CheckResult result = check(R"(
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function foo(values: {number}?)
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local s = 0
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for _, value in values do
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s += value
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end
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Value of type '{number}?' could be nil", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "unify_unsealed_table_union_check")
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{
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CheckResult result = check(R"(
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local x = { x = 3 }
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type A = number?
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type B = string?
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local y: { x: number, y: A | B }
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y = x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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result = check(R"(
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local x = { x = 3 }
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local a: number? = 2
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local y = {}
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y.x = 2
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y.y = a
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y = x
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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, "unify_sealed_table_union_check")
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{
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CheckResult result = check(R"(
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-- the difference between this and unify_unsealed_table_union_check is the type annotation on x
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local t = { x = 3, y = true }
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local x: { x: number } = t
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type A = number?
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type B = string?
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local y: { x: number, y: A | B }
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-- Shouldn't typecheck!
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y = x
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-- If it does, we can convert any type to any other type
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y.y = 5
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local oh : boolean = t.y
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)");
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LUAU_REQUIRE_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "error_detailed_union_part")
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{
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CheckResult result = check(R"(
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type X = { x: number }
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type Y = { y: number }
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type Z = { z: number }
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type XYZ = X | Y | Z
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local a: XYZ
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local b: { w: number } = a
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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const std::string expected = R"(Type 'X | Y | Z' could not be converted into '{| w: number |}'
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caused by:
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Not all union options are compatible.
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Table type 'X' not compatible with type '{| w: number |}' because the former is missing field 'w')";
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CHECK_EQ(expected, toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "error_detailed_union_all")
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{
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CheckResult result = check(R"(
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type X = { x: number }
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type Y = { y: number }
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type Z = { z: number }
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type XYZ = X | Y | Z
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local a: XYZ = { w = 4 }
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]), R"(Type 'a' could not be converted into 'X | Y | Z'; none of the union options are compatible)");
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}
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TEST_CASE_FIXTURE(Fixture, "error_detailed_optional")
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{
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CheckResult result = check(R"(
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type X = { x: number }
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local a: X? = { w = 4 }
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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const std::string expected = R"(Type 'a' could not be converted into 'X?'
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caused by:
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None of the union options are compatible. For example:
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Table type 'a' not compatible with type 'X' because the former is missing field 'x')";
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CHECK_EQ(expected, toString(result.errors[0]));
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}
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// We had a bug where a cyclic union caused a stack overflow.
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// ex type U = number | U
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TEST_CASE_FIXTURE(Fixture, "dont_allow_cyclic_unions_to_be_inferred")
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{
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CheckResult result = check(R"(
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--!strict
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function f(a, b)
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a:g(b or {})
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a:g(b)
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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(BuiltinsFixture, "table_union_write_indirect")
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{
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CheckResult result = check(R"(
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type A = { x: number, y: (number) -> string } | { z: number, y: (number) -> string }
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local a:A = nil
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function a.y(x)
|
|
return tostring(x * 2)
|
|
end
|
|
|
|
function a.y(x: string): number
|
|
return tonumber(x) or 0
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
// NOTE: union normalization will improve this message
|
|
const std::string expected = R"(Type
|
|
'(string) -> number'
|
|
could not be converted into
|
|
'((number) -> string) | ((number) -> string)'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_true_and_false")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : boolean
|
|
local y1 : (true | false) = x -- OK
|
|
local y2 : (true | false | (string & number)) = x -- OK
|
|
local y3 : (true | (string & number) | false) = x -- OK
|
|
local y4 : (true | (boolean & true) | false) = x -- OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : (number) -> number?
|
|
local y : ((number?) -> number?) | ((number) -> number) = x -- OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_generic_functions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : <a>(a) -> a?
|
|
local y : (<a>(a?) -> a?) | (<b>(b) -> b) = x -- Not OK
|
|
)");
|
|
|
|
// TODO: should this example typecheck?
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_generic_typepack_functions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : <a...>(number, a...) -> (number?, a...)
|
|
local y : (<a...>(number?, a...) -> (number?, a...)) | (<b...>(number, b...) -> (number, b...)) = x -- Not OK
|
|
)");
|
|
|
|
// TODO: should this example typecheck?
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_mentioning_generics")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a,b>()
|
|
local x : (a) -> a?
|
|
local y : ((a?) -> nil) | ((a) -> a) = x -- OK
|
|
local z : ((b?) -> nil) | ((b) -> b) = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '(a) -> a?' could not be converted into '((b) -> b) | ((b?) -> nil)'; none of the union options are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_mentioning_generic_typepacks")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...>()
|
|
local x : (number, a...) -> (number?, a...)
|
|
local y : ((number | string, a...) -> (number, a...)) | ((number?, a...) -> (nil, a...)) = x -- OK
|
|
local z : ((number) -> number) | ((number?, a...) -> (number?, a...)) = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'(number, a...) -> (number?, a...)'
|
|
could not be converted into
|
|
'((number) -> number) | ((number?, a...) -> (number?, a...))'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_with_mismatching_arg_arities")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : (number) -> number?
|
|
local y : ((number?) -> number) | ((number | string) -> nil) = x -- OK
|
|
local z : ((number, string?) -> number) | ((number) -> nil) = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'(number) -> number?'
|
|
could not be converted into
|
|
'((number) -> nil) | ((number, string?) -> number)'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_with_mismatching_result_arities")
|
|
{
|
|
|
|
CheckResult result = check(R"(
|
|
local x : () -> (number | string)
|
|
local y : (() -> number) | (() -> string) = x -- OK
|
|
local z : (() -> number) | (() -> (string, string)) = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'() -> number | string'
|
|
could not be converted into
|
|
'(() -> (string, string)) | (() -> number)'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_with_variadics")
|
|
{
|
|
|
|
CheckResult result = check(R"(
|
|
local x : (...nil) -> (...number?)
|
|
local y : ((...string?) -> (...number)) | ((...number?) -> nil) = x -- OK
|
|
local z : ((...string?) -> (...number)) | ((...string?) -> nil) = x -- OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'(...nil) -> (...number?)'
|
|
could not be converted into
|
|
'((...string?) -> (...number)) | ((...string?) -> nil)'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_with_mismatching_arg_variadics")
|
|
{
|
|
|
|
CheckResult result = check(R"(
|
|
local x : (number) -> ()
|
|
local y : ((number?) -> ()) | ((...number) -> ()) = x -- OK
|
|
local z : ((number?) -> ()) | ((...number?) -> ()) = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'(number) -> ()'
|
|
could not be converted into
|
|
'((...number?) -> ()) | ((number?) -> ())'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_of_functions_with_mismatching_result_variadics")
|
|
{
|
|
|
|
CheckResult result = check(R"(
|
|
local x : () -> (number?, ...number)
|
|
local y : (() -> (...number)) | (() -> nil) = x -- OK
|
|
local z : (() -> (...number)) | (() -> number) = x -- OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
const std::string expected = R"(Type
|
|
'() -> (number?, ...number)'
|
|
could not be converted into
|
|
'(() -> (...number)) | (() -> number)'; none of the union options are compatible)";
|
|
CHECK_EQ(expected, toString(result.errors[0]));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "less_greedy_unification_with_union_types")
|
|
{
|
|
if (!FFlag::DebugLuauDeferredConstraintResolution)
|
|
return;
|
|
|
|
CheckResult result = check(R"(
|
|
local function f(t): { x: number } | { x: string }
|
|
local x = t.x
|
|
return t
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("({| x: number |} | {| x: string |}) -> {| x: number |} | {| x: string |}", toString(requireType("f")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "less_greedy_unification_with_union_types_2")
|
|
{
|
|
if (!FFlag::DebugLuauDeferredConstraintResolution)
|
|
return;
|
|
|
|
CheckResult result = check(R"(
|
|
local function f(t: { x: number } | { x: string })
|
|
return t.x
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("({| x: number |} | {| x: string |}) -> number | string", toString(requireType("f")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_table_any_property")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f(x)
|
|
-- x : X
|
|
-- sup : { p : { q : X } }?
|
|
local sup = if true then { p = { q = x } } else nil
|
|
local sub : { p : any }
|
|
sup = nil
|
|
sup = sub
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_function_any_args")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local sup : ((...any) -> (...any))?
|
|
local sub : ((number) -> (...any))
|
|
sup = sub
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "optional_any")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local sup : any?
|
|
local sub : number
|
|
sup = sub
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "generic_function_with_optional_arg")
|
|
{
|
|
ScopedFastFlag sff[] = {
|
|
{"LuauTransitiveSubtyping", true},
|
|
};
|
|
|
|
CheckResult result = check(R"(
|
|
function f<T>(x : T?) : {T}
|
|
local result = {}
|
|
if x then
|
|
result[1] = x
|
|
end
|
|
return result
|
|
end
|
|
local t : {string} = f(nil)
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "lookup_prop_of_intersection_containing_unions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function mergeOptions<T>(options: T & ({} | {}))
|
|
return options.variables
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
const UnknownProperty* unknownProp = get<UnknownProperty>(result.errors[0]);
|
|
REQUIRE(unknownProp);
|
|
|
|
CHECK("variables" == unknownProp->key);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "suppress_errors_for_prop_lookup_of_a_union_that_includes_error")
|
|
{
|
|
ScopedFastFlag sff{"DebugLuauDeferredConstraintResolution", true};
|
|
|
|
registerHiddenTypes(&frontend);
|
|
|
|
CheckResult result = check(R"(
|
|
local a : err | Not<nil>
|
|
|
|
local b = a.foo
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_SUITE_END();
|