mirror of
https://github.com/luau-lang/luau.git
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62483d40f0
* Fixed rare use-after-free in analysis during table unification A lot of work these past months went into two new Luau components: * A near full rewrite of the typechecker using a new deferred constraint resolution system * Native code generation for AoT/JiT compilation of VM bytecode into x64 (avx)/arm64 instructions Both of these components are far from finished and we don't provide documentation on building and using them at this point. However, curious community members expressed interest in learning about changes that go into these components each week, so we are now listing them here in the 'sync' pull request descriptions. --- New typechecker can be enabled by setting DebugLuauDeferredConstraintResolution flag to 'true'. It is considered unstable right now, so try it at your own risk. Even though it already provides better type inference than the current one in some cases, our main goal right now is to reach feature parity with current typechecker. Features which improve over the capabilities of the current typechecker are marked as '(NEW)'. Changes to new typechecker: * Regular for loop index and parameters are now typechecked * Invalid type annotations on local variables are ignored to improve autocomplete * Fixed missing autocomplete type suggestions for function arguments * Type reduction is now performed to produce simpler types to be presented to the user (error messages, custom LSPs) * Internally, complex types like '((number | string) & ~(false?)) | string' can be produced, which is just 'string | number' when simplified * Fixed spots where support for unknown and never types was missing * (NEW) Length operator '#' is now valid to use on top table type, this type comes up when doing typeof(x) == "table" guards and isn't available in current typechecker --- Changes to native code generation: * Additional math library fast calls are now lowered to x64: math.ldexp, math.round, math.frexp, math.modf, math.sign and math.clamp
940 lines
29 KiB
C++
940 lines
29 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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TEST_SUITE_BEGIN("IntersectionTypes");
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TEST_CASE_FIXTURE(Fixture, "select_correct_union_fn")
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{
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CheckResult result = check(R"(
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type A = (number) -> (string)
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type B = (string) -> (number)
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local f:A & B
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local b = f(10) -- b is a string
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local c = f("a") -- c is a number
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(requireType("b"), typeChecker.stringType);
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CHECK_EQ(requireType("c"), typeChecker.numberType);
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}
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TEST_CASE_FIXTURE(Fixture, "table_combines")
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{
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CheckResult result = check(R"(
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type A={a:number}
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type B={b:string}
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local c:A & B = {a=10, b="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, "table_combines_missing")
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{
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CheckResult result = check(R"(
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type A={a:number}
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type B={b:string}
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local c:A & B = {a=10}
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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, "impossible_type")
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{
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CheckResult result = check(R"(
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local c:number&string = 10
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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, "table_extra_ok")
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{
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CheckResult result = check(R"(
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type A={a:number}
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type B={b:string}
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local c:A & B
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local d: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, "fx_intersection_as_argument")
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{
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CheckResult result = check(R"(
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type A = (number) -> (string)
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type B = (string) -> (number)
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type C = (A) -> (number)
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local f:A & B
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local g:C
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local b = g(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, "fx_union_as_argument_fails")
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{
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CheckResult result = check(R"(
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type A = (number) -> (string)
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type B = (string) -> (number)
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type C = (A) -> (number)
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local f:A | B
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local g:C
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local b = g(f)
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)");
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REQUIRE(!result.errors.empty());
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}
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TEST_CASE_FIXTURE(Fixture, "argument_is_intersection")
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{
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CheckResult result = check(R"(
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type A = (number | boolean) -> number
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local f: A
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f(5)
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f(true)
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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, "should_still_pick_an_overload_whose_arguments_are_unions")
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{
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CheckResult result = check(R"(
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type A = (number | boolean) -> number
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type B = (string | nil) -> string
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local f: A & B
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local a1, a2 = f(1), f(true)
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local b1, b2 = f("foo"), f(nil)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(*requireType("a1"), *typeChecker.numberType);
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CHECK_EQ(*requireType("a2"), *typeChecker.numberType);
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CHECK_EQ(*requireType("b1"), *typeChecker.stringType);
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CHECK_EQ(*requireType("b2"), *typeChecker.stringType);
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}
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TEST_CASE_FIXTURE(Fixture, "propagates_name")
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{
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if (FFlag::DebugLuauDeferredConstraintResolution)
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{
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CheckResult result = check(R"(
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type A={a:number}
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type B={b:string}
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local c:A&B
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local b = c
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK("{| a: number, b: string |}" == toString(requireType("b")));
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}
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else
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{
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const std::string code = R"(
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type A={a:number}
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type B={b:string}
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local c:A&B
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local b = c
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)";
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const std::string expected = R"(
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type A={a:number}
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type B={b:string}
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local c:A&B
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local b:A&B=c
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)";
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CHECK_EQ(expected, decorateWithTypes(code));
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}
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_an_intersection_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: {y: number}}
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type B = {x: {y: 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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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK("{| y: number |}" == toString(requireType("r")));
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else
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CHECK("{| y: number |} & {| y: number |}" == toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_an_intersection_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: string}}}}
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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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if (FFlag::DebugLuauDeferredConstraintResolution)
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{
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CHECK_EQ("string", toString(requireType("r")));
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}
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else
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{
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CHECK_EQ("string & string", toString(requireType("r")));
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}
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_an_intersection_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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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK_EQ("never", toString(requireType("r")));
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else
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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_an_intersection_type_with_one_part_missing_the_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_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_an_intersection_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 = {y: 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(*typeChecker.anyType, *requireType("r"));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_an_intersection_type_with_all_parts_missing_the_property")
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{
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CheckResult result = check(R"(
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type A = {}
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type B = {}
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local function f(t: A & B)
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local x = t.x
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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UnknownProperty* up = get<UnknownProperty>(result.errors[0]);
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REQUIRE_MESSAGE(up, result.errors[0].data);
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CHECK_EQ(up->key, "x");
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}
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TEST_CASE_FIXTURE(Fixture, "table_intersection_write")
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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 XY = X & { y: number }
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local a : XY = { x = 1, y = 2 }
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a.x = 10
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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result = check(R"(
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type X = {}
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type XY = X & { x: number, y: number }
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local a : XY = { x = 1, y = 2 }
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a.x = 10
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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result = check(R"(
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type X = { x: number }
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type Y = { y: number }
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type XY = X & Y
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local a : XY = { x = 1, y = 2 }
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a.x = 10
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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result = check(R"(
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type A = { x: {y: number} }
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type B = { x: {y: number} }
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local t : A & B = { x = { y = 1 } }
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t.x = { y = 4 }
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t.x.y = 40
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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, "table_intersection_write_sealed")
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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 XY = X & Y
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local a : XY = { x = 1, y = 2 }
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a.z = 10
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]), "Cannot add property 'z' to table 'X & Y'");
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}
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TEST_CASE_FIXTURE(Fixture, "table_intersection_write_sealed_indirect")
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{
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CheckResult result = check(R"(
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type X = { x: (number) -> number }
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type Y = { y: (string) -> string }
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type XY = X & Y
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local xy : XY = {
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x = function(a: number) return -a end,
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y = function(a: string) return a .. "b" end
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}
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function xy.z(a:number) return a * 10 end
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function xy:y(a:number) return a * 10 end
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function xy:w(a:number) return a * 10 end
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)");
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LUAU_REQUIRE_ERROR_COUNT(4, result);
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CHECK_EQ(toString(result.errors[0]), R"(Type '(string, number) -> string' could not be converted into '(string) -> string'
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caused by:
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Argument count mismatch. Function expects 2 arguments, but only 1 is specified)");
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CHECK_EQ(toString(result.errors[1]), "Cannot add property 'z' to table 'X & Y'");
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CHECK_EQ(toString(result.errors[2]), "Type 'number' could not be converted into 'string'");
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CHECK_EQ(toString(result.errors[3]), "Cannot add property 'w' to table 'X & Y'");
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}
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TEST_CASE_FIXTURE(Fixture, "table_write_sealed_indirect")
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{
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// After normalization, previous 'table_intersection_write_sealed_indirect' is identical to this one
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CheckResult result = check(R"(
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type XY = { x: (number) -> number, y: (string) -> string }
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local xy : XY = {
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x = function(a: number) return -a end,
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y = function(a: string) return a .. "b" end
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}
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function xy.z(a:number) return a * 10 end
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function xy:y(a:number) return a * 10 end
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function xy:w(a:number) return a * 10 end
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)");
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LUAU_REQUIRE_ERROR_COUNT(4, result);
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CHECK_EQ(toString(result.errors[0]), R"(Type '(string, number) -> string' could not be converted into '(string) -> string'
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caused by:
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Argument count mismatch. Function expects 2 arguments, but only 1 is specified)");
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CHECK_EQ(toString(result.errors[1]), "Cannot add property 'z' to table 'XY'");
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CHECK_EQ(toString(result.errors[2]), "Type 'number' could not be converted into 'string'");
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CHECK_EQ(toString(result.errors[3]), "Cannot add property 'w' to table 'XY'");
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "table_intersection_setmetatable")
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{
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CheckResult result = check(R"(
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local t: {} & {}
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setmetatable(t, {})
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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_detailed_intersection_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 = 3
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK_EQ(toString(result.errors[0]), R"(Type 'number' could not be converted into '{| x: number, y: number, z: number |}')");
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else
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CHECK_EQ(toString(result.errors[0]), R"(Type 'number' could not be converted into 'X & Y & Z'
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caused by:
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Not all intersection parts are compatible. Type 'number' could not be converted into 'X')");
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}
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TEST_CASE_FIXTURE(Fixture, "error_detailed_intersection_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
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local b: number = a
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK_EQ(toString(result.errors[0]), R"(Type '{| x: number, y: number, z: number |}' could not be converted into 'number')");
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else
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CHECK_EQ(
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toString(result.errors[0]), R"(Type 'X & Y & Z' could not be converted into 'number'; none of the intersection parts are compatible)");
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}
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TEST_CASE_FIXTURE(Fixture, "overload_is_not_a_function")
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{
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check(R"(
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--!nonstrict
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function _(...):((typeof(not _))&(typeof(not _)))&((typeof(not _))&(typeof(not _)))
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_(...)(setfenv,_,not _,"")[_] = nil
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end
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do end
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_(...)(...,setfenv,_):_G()
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)");
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}
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TEST_CASE_FIXTURE(Fixture, "no_stack_overflow_from_flattenintersection")
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{
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CheckResult result = check(R"(
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local l0,l0
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repeat
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type t0 = ((any)|((any)&((any)|((any)&((any)|(any))))))&(t0)
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function _(l0):(t0)&(t0)
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while nil do
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end
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end
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until _(_)(_)._
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)");
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LUAU_REQUIRE_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "intersect_bool_and_false")
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{
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CheckResult result = check(R"(
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local x : (boolean & false)
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local y : false = x -- OK
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local z : true = x -- Not OK
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK_EQ(toString(result.errors[0]), "Type 'false' could not be converted into 'true'");
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else
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CHECK_EQ(
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toString(result.errors[0]), "Type 'boolean & false' could not be converted into 'true'; none of the intersection parts are compatible");
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}
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TEST_CASE_FIXTURE(Fixture, "intersect_false_and_bool_and_false")
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{
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CheckResult result = check(R"(
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local x : false & (boolean & false)
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local y : false = x -- OK
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local z : true = x -- Not OK
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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if (FFlag::DebugLuauDeferredConstraintResolution)
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CHECK_EQ(toString(result.errors[0]), "Type 'false' could not be converted into 'true'");
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else
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{
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// TODO: odd stringification of `false & (boolean & false)`.)
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CHECK_EQ(toString(result.errors[0]),
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"Type 'boolean & false & false' could not be converted into 'true'; none of the intersection parts are compatible");
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}
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}
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TEST_CASE_FIXTURE(Fixture, "intersect_saturate_overloaded_functions")
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{
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CheckResult result = check(R"(
|
|
local x : ((number?) -> number?) & ((string?) -> string?)
|
|
local y : (nil) -> nil = x -- OK
|
|
local z : (number) -> number = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number?) -> number?) & ((string?) -> string?)' could not be converted into '(number) -> number'; "
|
|
"none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "union_saturate_overloaded_functions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : ((number) -> number) & ((string) -> string)
|
|
local y : ((number | string) -> (number | string)) = x -- OK
|
|
local z : ((number | boolean) -> (number | boolean)) = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number) -> number) & ((string) -> string)' could not be converted into '(boolean | number) -> "
|
|
"boolean | number'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "intersection_of_tables")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : { p : number?, q : string? } & { p : number?, q : number?, r : number? }
|
|
local y : { p : number?, q : nil, r : number? } = x -- OK
|
|
local z : { p : nil } = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
if (FFlag::DebugLuauDeferredConstraintResolution)
|
|
{
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '{| p: number?, q: nil, r: number? |}' could not be converted into '{| p: nil |}'\n"
|
|
"caused by:\n"
|
|
" Property 'p' is not compatible. Type 'number?' could not be converted into 'nil'\n"
|
|
"caused by:\n"
|
|
" Not all union options are compatible. Type 'number' could not be converted into 'nil' in an invariant context");
|
|
}
|
|
else
|
|
{
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '{| p: number?, q: number?, r: number? |} & {| p: number?, q: string? |}' could not be converted into "
|
|
"'{| p: nil |}'; none of the intersection parts are compatible");
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "intersection_of_tables_with_top_properties")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : { p : number?, q : any } & { p : unknown, q : string? }
|
|
local y : { p : number?, q : string? } = x -- OK
|
|
local z : { p : string?, q : number? } = x -- Not OK
|
|
)");
|
|
|
|
if (FFlag::DebugLuauDeferredConstraintResolution)
|
|
{
|
|
LUAU_REQUIRE_ERROR_COUNT(2, result);
|
|
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '{| p: number?, q: string? |}' could not be converted into '{| p: string?, q: number? |}'\n"
|
|
"caused by:\n"
|
|
" Property 'p' is not compatible. Type 'number?' could not be converted into 'string?'\n"
|
|
"caused by:\n"
|
|
" Not all union options are compatible. Type 'number' could not be converted into 'string?'\n"
|
|
"caused by:\n"
|
|
" None of the union options are compatible. For example: Type 'number' could not be converted into 'string' in an invariant context");
|
|
|
|
CHECK_EQ(toString(result.errors[1]),
|
|
"Type '{| p: number?, q: string? |}' could not be converted into '{| p: string?, q: number? |}'\n"
|
|
"caused by:\n"
|
|
" Property 'q' is not compatible. Type 'string?' could not be converted into 'number?'\n"
|
|
"caused by:\n"
|
|
" Not all union options are compatible. Type 'string' could not be converted into 'number?'\n"
|
|
"caused by:\n"
|
|
" None of the union options are compatible. For example: Type 'string' could not be converted into 'number' in an invariant context");
|
|
}
|
|
else
|
|
{
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '{| p: number?, q: any |} & {| p: unknown, q: string? |}' could not be converted into '{| p: string?, "
|
|
"q: number? |}'; none of the intersection parts are compatible");
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "intersection_of_tables_with_never_properties")
|
|
{
|
|
ScopedFastFlag sffs[]{
|
|
{"LuauUninhabitedSubAnything2", true},
|
|
};
|
|
|
|
CheckResult result = check(R"(
|
|
local x : { p : number?, q : never } & { p : never, q : string? } -- OK
|
|
local y : { p : never, q : never } = x -- OK
|
|
local z : never = x -- OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloaded_functions_returning_intersections")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : ((number?) -> ({ p : number } & { q : number })) & ((string?) -> ({ p : number } & { r : number }))
|
|
local y : (nil) -> { p : number, q : number, r : number} = x -- OK
|
|
local z : (number?) -> { p : number, q : number, r : number} = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
if (FFlag::DebugLuauDeferredConstraintResolution)
|
|
{
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '((number?) -> {| p: number, q: number |}) & ((string?) -> {| p: number, r: number |})' could not be converted into "
|
|
"'(number?) -> {| p: number, q: number, r: number |}'; none of the intersection parts are compatible");
|
|
}
|
|
else
|
|
{
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '((number?) -> {| p: number |} & {| q: number |}) & ((string?) -> {| p: number |} & {| r: number |})' could not be converted into "
|
|
"'(number?) -> {| p: number, q: number, r: number |}'; none of the intersection parts are compatible");
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloaded_functions_mentioning_generic")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a>()
|
|
local x : ((number?) -> (a | number)) & ((string?) -> (a | string))
|
|
local y : (nil) -> a = x -- OK
|
|
local z : (number?) -> a = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number?) -> a | number) & ((string?) -> a | string)' could not be converted into '(number?) -> a'; "
|
|
"none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloaded_functions_mentioning_generics")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a,b,c>()
|
|
local x : ((a?) -> (a | b)) & ((c?) -> (b | c))
|
|
local y : (nil) -> ((a & c) | b) = x -- OK
|
|
local z : (a?) -> ((a & c) | b) = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '((a?) -> a | b) & ((c?) -> b | c)' could not be converted into '(a?) -> (a & c) | b'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloaded_functions_mentioning_generic_packs")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((number?, a...) -> (number?, b...)) & ((string?, a...) -> (string?, b...))
|
|
local y : ((nil, a...) -> (nil, b...)) = x -- OK
|
|
local z : ((nil, b...) -> (nil, a...)) = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number?, a...) -> (number?, b...)) & ((string?, a...) -> (string?, b...))' could not be converted "
|
|
"into '(nil, b...) -> (nil, a...)'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_unknown_result")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((number) -> number) & ((nil) -> unknown)
|
|
local y : (number?) -> unknown = x -- OK
|
|
local z : (number?) -> number? = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((nil) -> unknown) & ((number) -> number)' could not be converted into '(number?) -> number?'; none "
|
|
"of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_unknown_arguments")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((number) -> number?) & ((unknown) -> string?)
|
|
local y : (number) -> nil = x -- OK
|
|
local z : (number?) -> nil = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number) -> number?) & ((unknown) -> string?)' could not be converted into '(number?) -> nil'; none "
|
|
"of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_never_result")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((number) -> number) & ((nil) -> never)
|
|
local y : (number?) -> number = x -- OK
|
|
local z : (number?) -> never = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((nil) -> never) & ((number) -> number)' could not be converted into '(number?) -> never'; none of "
|
|
"the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_never_arguments")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((number) -> number?) & ((never) -> string?)
|
|
local y : (never) -> nil = x -- OK
|
|
local z : (number?) -> nil = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((never) -> string?) & ((number) -> number?)' could not be converted into '(number?) -> nil'; none "
|
|
"of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_overlapping_results_and_variadics")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x : ((string?) -> (string | number)) & ((number?) -> ...number)
|
|
local y : ((nil) -> (number, number?)) = x -- OK
|
|
local z : ((string | number) -> (number, number?)) = x -- Not OK
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((number?) -> (...number)) & ((string?) -> number | string)' could not be converted into '(number | "
|
|
"string) -> (number, number?)'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_weird_typepacks_1")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : (() -> a...) & (() -> b...)
|
|
local y : (() -> b...) & (() -> a...) = x -- OK
|
|
local z : () -> () = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '(() -> (a...)) & (() -> (b...))' could not be converted into '() -> ()'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_weird_typepacks_2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...,b...>()
|
|
local x : ((a...) -> ()) & ((b...) -> ())
|
|
local y : ((b...) -> ()) & ((a...) -> ()) = x -- OK
|
|
local z : () -> () = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '((a...) -> ()) & ((b...) -> ())' could not be converted into '() -> ()'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_weird_typepacks_3")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...>()
|
|
local x : (() -> a...) & (() -> (number?,a...))
|
|
local y : (() -> (number?,a...)) & (() -> a...) = x -- OK
|
|
local z : () -> (number) = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]),
|
|
"Type '(() -> (a...)) & (() -> (number?, a...))' could not be converted into '() -> number'; none of the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "overloadeded_functions_with_weird_typepacks_4")
|
|
{
|
|
CheckResult result = check(R"(
|
|
function f<a...>()
|
|
local x : ((a...) -> ()) & ((number,a...) -> number)
|
|
local y : ((number,a...) -> number) & ((a...) -> ()) = x -- OK
|
|
local z : (number?) -> () = x -- Not OK
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
CHECK_EQ(toString(result.errors[0]), "Type '((a...) -> ()) & ((number, a...) -> number)' could not be converted into '(number?) -> ()'; none of "
|
|
"the intersection parts are compatible");
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "intersect_metatables")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local a : string? = nil
|
|
local b : number? = nil
|
|
|
|
local x = setmetatable({}, { p = 5, q = a });
|
|
local y = setmetatable({}, { q = b, r = "hi" });
|
|
local z = setmetatable({}, { p = 5, q = nil, r = "hi" });
|
|
|
|
type X = typeof(x)
|
|
type Y = typeof(y)
|
|
type Z = typeof(z)
|
|
|
|
local xy : X&Y = z;
|
|
local yx : Y&X = z;
|
|
z = xy;
|
|
z = yx;
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "intersect_metatable_subtypes")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x = setmetatable({ a = 5 }, { p = 5 });
|
|
local y = setmetatable({ b = "hi" }, { p = 5, q = "hi" });
|
|
local z = setmetatable({ a = 5, b = "hi" }, { p = 5, q = "hi" });
|
|
|
|
type X = typeof(x)
|
|
type Y = typeof(y)
|
|
type Z = typeof(z)
|
|
|
|
local xy : X&Y = z;
|
|
local yx : Y&X = z;
|
|
z = xy;
|
|
z = yx;
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "intersect_metatables_with_properties")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x = setmetatable({ a = 5 }, { p = 5 });
|
|
local y = setmetatable({ b = "hi" }, { q = "hi" });
|
|
local z = setmetatable({ a = 5, b = "hi" }, { p = 5, q = "hi" });
|
|
|
|
type X = typeof(x)
|
|
type Y = typeof(y)
|
|
type Z = typeof(z)
|
|
|
|
local xy : X&Y = z;
|
|
z = xy;
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "intersect_metatable_with_table")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local x = setmetatable({ a = 5 }, { p = 5 });
|
|
local z = setmetatable({ a = 5, b = "hi" }, { p = 5 });
|
|
|
|
type X = typeof(x)
|
|
type Y = { b : string }
|
|
type Z = typeof(z)
|
|
|
|
-- TODO: once we have shape types, we should be able to initialize these with z
|
|
local xy : X&Y;
|
|
local yx : Y&X;
|
|
z = xy;
|
|
z = yx;
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "CLI-44817")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type X = {x: number}
|
|
type Y = {y: number}
|
|
type Z = {z: number}
|
|
|
|
type XY = {x: number, y: number}
|
|
type XYZ = {x:number, y: number, z: number}
|
|
|
|
local xy: XY = {x = 0, y = 0}
|
|
local xyz: XYZ = {x = 0, y = 0, z = 0}
|
|
|
|
local xNy: X&Y = xy
|
|
local xNyNz: X&Y&Z = xyz
|
|
|
|
local t1: XY = xNy -- Type 'X & Y' could not be converted into 'XY'
|
|
local t2: XY = xNyNz -- Type 'X & Y & Z' could not be converted into 'XY'
|
|
local t3: XYZ = xNyNz -- Type 'X & Y & Z' could not be converted into 'XYZ'
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "less_greedy_unification_with_intersection_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("(never) -> never", toString(requireType("f")));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "less_greedy_unification_with_intersection_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("(never) -> never", toString(requireType("f")));
|
|
}
|
|
|
|
TEST_SUITE_END();
|