mirror of
https://github.com/luau-lang/luau.git
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337 lines
8.1 KiB
C++
337 lines
8.1 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 "Fixture.h"
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#include "doctest.h"
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using namespace Luau;
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TEST_SUITE_BEGIN("TypeInferUnknownNever");
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TEST_CASE_FIXTURE(Fixture, "string_subtype_and_unknown_supertype")
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{
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CheckResult result = check(R"(
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local function f(x: string)
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local foo: unknown = x
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "unknown_subtype_and_string_supertype")
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{
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CheckResult result = check(R"(
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local function f(x: unknown)
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local foo: string = x
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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}
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TEST_CASE_FIXTURE(Fixture, "unknown_is_reflexive")
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{
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CheckResult result = check(R"(
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local function f(x: unknown)
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local foo: unknown = x
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "string_subtype_and_never_supertype")
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{
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CheckResult result = check(R"(
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local function f(x: string)
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local foo: never = x
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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}
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TEST_CASE_FIXTURE(Fixture, "never_subtype_and_string_supertype")
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{
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CheckResult result = check(R"(
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local function f(x: never)
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local foo: string = x
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "never_is_reflexive")
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{
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CheckResult result = check(R"(
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local function f(x: never)
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local foo: never = x
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "unknown_is_optional_because_it_too_encompasses_nil")
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{
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CheckResult result = check(R"(
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local t: {x: unknown} = {}
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)");
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}
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TEST_CASE_FIXTURE(Fixture, "table_with_prop_of_type_never_is_uninhabitable")
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{
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CheckResult result = check(R"(
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local t: {x: never} = {}
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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, "table_with_prop_of_type_never_is_also_reflexive")
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{
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CheckResult result = check(R"(
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local t: {x: never} = {x = 5 :: never}
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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, "array_like_table_of_never_is_inhabitable")
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{
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CheckResult result = check(R"(
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local t: {never} = {}
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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, "type_packs_containing_never_is_itself_uninhabitable")
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{
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CheckResult result = check(R"(
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local function f() return "foo", 5 :: never end
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local x, y, z = f()
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)");
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if (FFlag::DebugLuauDeferredConstraintResolution)
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{
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Function only returns 2 values, but 3 are required here", toString(result.errors[0]));
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CHECK_EQ("string", toString(requireType("x")));
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CHECK_EQ("never", toString(requireType("y")));
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CHECK_EQ("*error-type*", toString(requireType("z")));
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}
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else
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{
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("never", toString(requireType("x")));
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CHECK_EQ("never", toString(requireType("y")));
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CHECK_EQ("never", toString(requireType("z")));
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}
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}
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TEST_CASE_FIXTURE(Fixture, "type_packs_containing_never_is_itself_uninhabitable2")
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{
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CheckResult result = check(R"(
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local function f(): (string, never) return "", 5 :: never end
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local function g(): (never, string) return 5 :: never, "" end
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local x1, x2 = f()
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local y1, y2 = g()
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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("x1")));
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CHECK_EQ("never", toString(requireType("x2")));
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CHECK_EQ("never", toString(requireType("y1")));
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CHECK_EQ("string", toString(requireType("y2")));
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}
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else
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{
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CHECK_EQ("never", toString(requireType("x1")));
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CHECK_EQ("never", toString(requireType("x2")));
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CHECK_EQ("never", toString(requireType("y1")));
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CHECK_EQ("never", toString(requireType("y2")));
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}
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_never")
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{
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CheckResult result = check(R"(
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local x: never = 5 :: never
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local z = x.y
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("never", toString(requireType("z")));
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}
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TEST_CASE_FIXTURE(Fixture, "call_never")
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{
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CheckResult result = check(R"(
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local f: never = 5 :: never
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local x, y, z = f()
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("never", toString(requireType("x")));
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CHECK_EQ("never", toString(requireType("y")));
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CHECK_EQ("never", toString(requireType("z")));
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}
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TEST_CASE_FIXTURE(Fixture, "assign_to_local_which_is_never")
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{
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CheckResult result = check(R"(
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local t: never
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t = 3
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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, "assign_to_global_which_is_never")
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{
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CheckResult result = check(R"(
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--!nonstrict
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t = 5 :: never
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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, "assign_to_prop_which_is_never")
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{
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CheckResult result = check(R"(
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local t: never
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t.x = 5
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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, "assign_to_subscript_which_is_never")
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{
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CheckResult result = check(R"(
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local t: never
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t[5] = 7
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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, "assign_to_subscript_which_is_never")
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{
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CheckResult result = check(R"(
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for i, v in (5 :: never) do
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "pick_never_from_variadic_type_pack")
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{
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CheckResult result = check(R"(
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local function f(...: never)
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local x, y = (...)
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_union_of_tables_for_properties_that_is_never")
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{
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CheckResult result = check(R"(
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type Disjoint = {foo: never, bar: unknown, tag: "ok"} | {foo: never, baz: unknown, tag: "err"}
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local disjoint: Disjoint = {foo = 5 :: never, bar = true, tag = "ok"}
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local foo = disjoint.foo
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("never", toString(requireType("foo")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_union_of_tables_for_properties_that_is_sorta_never")
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{
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CheckResult result = check(R"(
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type Disjoint = {foo: string, bar: unknown, tag: "ok"} | {foo: never, baz: unknown, tag: "err"}
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local disjoint: Disjoint = {foo = 5 :: never, bar = true, tag = "ok"}
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local foo = disjoint.foo
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("string", toString(requireType("foo")));
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}
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TEST_CASE_FIXTURE(Fixture, "unary_minus_of_never")
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{
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CheckResult result = check(R"(
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local x = -(5 :: never)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("never", toString(requireType("x")));
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}
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TEST_CASE_FIXTURE(Fixture, "length_of_never")
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{
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CheckResult result = check(R"(
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local x = #({} :: never)
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number", toString(requireType("x")));
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}
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TEST_CASE_FIXTURE(Fixture, "dont_unify_operands_if_one_of_the_operand_is_never_in_any_ordering_operators")
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{
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ScopedFastFlag sff[]{
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{"LuauTryhardAnd", true},
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};
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CheckResult result = check(R"(
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local function ord(x: nil, y)
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return x ~= nil and x > y
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end
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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("<a>(nil, a) -> boolean", toString(requireType("ord")));
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else
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{
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// Widening doesn't normalize yet, so the result is a bit strange
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CHECK_EQ("<a>(nil, a) -> boolean | boolean", toString(requireType("ord")));
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}
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}
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TEST_CASE_FIXTURE(Fixture, "math_operators_and_never")
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{
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CheckResult result = check(R"(
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local function mul(x: nil, y)
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return x ~= nil and x * y -- infers boolean | never, which is normalized into boolean
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("<a>(nil, a) -> boolean", toString(requireType("mul")));
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}
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TEST_SUITE_END();
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