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luau/tests/TypeInfer.singletons.test.cpp
vegorov-rbx 97965c7c0a
Sync to upstream/release/576 (#928) 
* `ClassType` can now have an indexer defined on it. This allows custom
types to be used in `t[x]` expressions.
* Fixed search for closest executable breakpoint line. Previously,
breakpoints might have been skipped in `else` blocks at the end of a
function
* Fixed how unification is performed for two optional types `a? <: b?`,
previously it might have unified either 'a' or 'b' with 'nil'. Note that
this fix is not enabled by default yet (see the list in
`ExperimentalFlags.h`)

In the new type solver, a concept of 'Type Families' has been
introduced.
Type families can be thought of as type aliases with custom type
inference/reduction logic included with them.
For example, we can have an `Add<T, U>` type family that will resolve
the type that is the result of adding two values together.
This will help type inference to figure out what 'T' and 'U' might be
when explicit type annotations are not provided.
In this update we don't define any type families, but they will be added
in the near future.
It is also possible for Luau embedders to define their own type families
in the global/environment scope.

Other changes include:
* Fixed scope used to find out which generic types should be included in
the function generic type list
* Fixed a crash after cyclic bound types were created during unification

And in native code generation (jit):
* Use of arm64 target on M1 now requires macOS 13
* Entry into native code has been optimized. This is especially
important for coroutine call/pcall performance as they involve going
through a C call frame
* LOP_LOADK(X) translation into IR has been improved to enable type
tag/constant propagation
* arm64 can use integer immediate values to synthesize floating-point
values
* x64 assembler removes duplicate 64bit numbers from the data section to
save space
* Linux `perf` can now be used to profile native Luau code (when running
with --codegen-perf CLI argument)
2023-05-12 10:50:47 -07:00

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "Fixture.h"
#include "doctest.h"
#include "Luau/BuiltinDefinitions.h"
using namespace Luau;
TEST_SUITE_BEGIN("TypeSingletons");
TEST_CASE_FIXTURE(Fixture, "bool_singletons")
{
CheckResult result = check(R"(
local a: true = true
local b: false = false
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "string_singletons")
{
CheckResult result = check(R"(
local a: "foo" = "foo"
local b: "bar" = "bar"
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "bool_singletons_mismatch")
{
CheckResult result = check(R"(
local a: true = false
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Type 'false' could not be converted into 'true'", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "string_singletons_mismatch")
{
CheckResult result = check(R"(
local a: "foo" = "bar"
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Type '\"bar\"' could not be converted into '\"foo\"'", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "string_singletons_escape_chars")
{
CheckResult result = check(R"(
local a: "\n" = "\000\r"
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(R"(Type '"\000\r"' could not be converted into '"\n"')", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "bool_singleton_subtype")
{
CheckResult result = check(R"(
local a: true = true
local b: boolean = a
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "string_singleton_subtype")
{
CheckResult result = check(R"(
local a: "foo" = "foo"
local b: string = a
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "string_singleton_subtype_multi_assignment")
{
CheckResult result = check(R"(
local a: "foo" = "foo"
local b: string, c: number = a, 10
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "function_call_with_singletons")
{
CheckResult result = check(R"(
function f(a: true, b: "foo") end
f(true, "foo")
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "function_call_with_singletons_mismatch")
{
CheckResult result = check(R"(
function f(a: true, b: "foo") end
f(true, "bar")
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Type '\"bar\"' could not be converted into '\"foo\"'", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "overloaded_function_call_with_singletons")
{
CheckResult result = check(R"(
function f(a, b) end
local g : ((true, string) -> ()) & ((false, number) -> ()) = (f::any)
g(true, "foo")
g(false, 37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "overloaded_function_call_with_singletons_mismatch")
{
CheckResult result = check(R"(
function f(a, b) end
local g : ((true, string) -> ()) & ((false, number) -> ()) = (f::any)
g(true, 37)
)");
LUAU_REQUIRE_ERROR_COUNT(2, result);
if (FFlag::DebugLuauDeferredConstraintResolution)
{
CHECK_EQ("None of the overloads for function that accept 2 arguments are compatible.", toString(result.errors[0]));
CHECK_EQ("Available overloads: (true, string) -> (); and (false, number) -> ()", toString(result.errors[1]));
}
else
{
CHECK_EQ("Type 'number' could not be converted into 'string'", toString(result.errors[0]));
CHECK_EQ("Other overloads are also not viable: (false, number) -> ()", toString(result.errors[1]));
}
}
TEST_CASE_FIXTURE(Fixture, "enums_using_singletons")
{
CheckResult result = check(R"(
type MyEnum = "foo" | "bar" | "baz"
local a : MyEnum = "foo"
local b : MyEnum = "bar"
local c : MyEnum = "baz"
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "enums_using_singletons_mismatch")
{
CheckResult result = check(R"(
type MyEnum = "foo" | "bar" | "baz"
local a : MyEnum = "bang"
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Type '\"bang\"' could not be converted into '\"bar\" | \"baz\" | \"foo\"'; none of the union options are compatible",
toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "enums_using_singletons_subtyping")
{
CheckResult result = check(R"(
type MyEnum1 = "foo" | "bar"
type MyEnum2 = MyEnum1 | "baz"
local a : MyEnum1 = "foo"
local b : MyEnum2 = a
local c : string = b
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "tagged_unions_using_singletons")
{
CheckResult result = check(R"(
type Dog = { tag: "Dog", howls: boolean }
type Cat = { tag: "Cat", meows: boolean }
type Animal = Dog | Cat
local a : Dog = { tag = "Dog", howls = true }
local b : Animal = { tag = "Cat", meows = true }
local c : Animal = a
c = b
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "tagged_unions_using_singletons_mismatch")
{
CheckResult result = check(R"(
type Dog = { tag: "Dog", howls: boolean }
type Cat = { tag: "Cat", meows: boolean }
type Animal = Dog | Cat
local a : Animal = { tag = "Cat", howls = true }
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "tagged_unions_immutable_tag")
{
CheckResult result = check(R"(
type Dog = { tag: "Dog", howls: boolean }
type Cat = { tag: "Cat", meows: boolean }
type Animal = Dog | Cat
local a : Animal = { tag = "Cat", meows = true }
a.tag = "Dog"
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "table_has_a_boolean")
{
CheckResult result = check(R"(
local t={a=1,b=false}
)");
CHECK("{ a: number, b: boolean }" == toString(requireType("t"), {true}));
}
TEST_CASE_FIXTURE(Fixture, "table_properties_singleton_strings")
{
CheckResult result = check(R"(
--!strict
type T = {
["foo"] : number,
["$$bar"] : string,
baz : boolean
}
local t: T = {
["foo"] = 37,
["$$bar"] = "hi",
baz = true
}
local a: number = t.foo
local b: string = t["$$bar"]
local c: boolean = t.baz
t.foo = 5
t["$$bar"] = "lo"
t.baz = false
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "table_properties_singleton_strings_mismatch")
{
CheckResult result = check(R"(
--!strict
type T = {
["$$bar"] : string,
}
local t: T = {
["$$bar"] = "hi",
}
t["$$bar"] = 5
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Type 'number' could not be converted into 'string'", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "table_properties_alias_or_parens_is_indexer")
{
CheckResult result = check(R"(
--!strict
type S = "bar"
type T = {
[("foo")] : number,
[S] : string,
}
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ("Cannot have more than one table indexer", toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "table_properties_type_error_escapes")
{
CheckResult result = check(R"(
--!strict
local x: { ["<>"] : number }
x = { ["\n"] = 5 }
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(R"(Table type '{ ["\n"]: number }' not compatible with type '{| ["<>"]: number |}' because the former is missing field '<>')",
toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "error_detailed_tagged_union_mismatch_string")
{
CheckResult result = check(R"(
type Cat = { tag: 'cat', catfood: string }
type Dog = { tag: 'dog', dogfood: string }
type Animal = Cat | Dog
local a: Animal = { tag = 'cat', cafood = 'something' }
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(R"(Type 'a' could not be converted into 'Cat | Dog'
caused by:
None of the union options are compatible. For example: Table type 'a' not compatible with type 'Cat' because the former is missing field 'catfood')",
toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "error_detailed_tagged_union_mismatch_bool")
{
CheckResult result = check(R"(
type Good = { success: true, result: string }
type Bad = { success: false, error: string }
type Result = Good | Bad
local a: Result = { success = false, result = 'something' }
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(R"(Type 'a' could not be converted into 'Bad | Good'
caused by:
None of the union options are compatible. For example: Table type 'a' not compatible with type 'Bad' because the former is missing field 'error')",
toString(result.errors[0]));
}
TEST_CASE_FIXTURE(Fixture, "parametric_tagged_union_alias")
{
ScopedFastFlag sff[] = {
{"DebugLuauDeferredConstraintResolution", true},
};
CheckResult result = check(R"(
type Ok<T> = {success: true, result: T}
type Err<T> = {success: false, error: T}
type Result<O, E> = Ok<O> | Err<E>
local a : Result<string, number> = {success = false, result = "hotdogs"}
local b : Result<string, number> = {success = true, result = "hotdogs"}
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
const std::string expectedError = "Type 'a' could not be converted into 'Err<number> | Ok<string>'\n"
"caused by:\n"
" None of the union options are compatible. For example: Table type 'a'"
" not compatible with type 'Err<number>' because the former is missing field 'error'";
CHECK(toString(result.errors[0]) == expectedError);
}
TEST_CASE_FIXTURE(Fixture, "if_then_else_expression_singleton_options")
{
CheckResult result = check(R"(
type Cat = { tag: 'cat', catfood: string }
type Dog = { tag: 'dog', dogfood: string }
type Animal = Cat | Dog
local a: Animal = if true then { tag = 'cat', catfood = 'something' } else { tag = 'dog', dogfood = 'other' }
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "widen_the_supertype_if_it_is_free_and_subtype_has_singleton")
{
CheckResult result = check(R"(
local function foo(f, x)
if x == "hi" then
f(x)
f("foo")
end
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("hi")", toString(requireTypeAtPosition({3, 18})));
// should be <a...>((string) -> a..., string) -> () but needs lower bounds calculation
CHECK_EQ("<a, b...>((string) -> (b...), a) -> ()", toString(requireType("foo")));
}
TEST_CASE_FIXTURE(Fixture, "return_type_of_f_is_not_widened")
{
ScopedFastFlag sff{"LuauUnifyTwoOptions", true};
CheckResult result = check(R"(
local function foo(f, x): "hello"? -- anyone there?
return if x == "hi"
then f(x)
else nil
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("hi")", toString(requireTypeAtPosition({3, 23})));
CHECK_EQ(R"(<a, b...>((string) -> ("hello", b...), a) -> "hello"?)", toString(requireType("foo")));
// This is more accurate but we're not there yet:
// CHECK_EQ(R"(<a, b...>((string) -> ("hello"?, b...), a) -> "hello"?)", toString(requireType("foo")));
}
TEST_CASE_FIXTURE(Fixture, "widening_happens_almost_everywhere")
{
CheckResult result = check(R"(
local foo: "foo" = "foo"
local copy = foo
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("string", toString(requireType("copy")));
}
TEST_CASE_FIXTURE(Fixture, "widening_happens_almost_everywhere_except_for_tables")
{
CheckResult result = check(R"(
type Cat = {tag: "Cat", meows: boolean}
type Dog = {tag: "Dog", barks: boolean}
type Animal = Cat | Dog
local function f(tag: "Cat" | "Dog"): Animal?
if tag == "Cat" then
local result = {tag = tag, meows = true}
return result
elseif tag == "Dog" then
local result = {tag = tag, barks = true}
return result
else
return nil
end
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "functions_are_not_to_be_widened")
{
CheckResult result = check(R"(
local function foo(my_enum: "A" | "B") end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"(("A" | "B") -> ())", toString(requireType("foo")));
}
TEST_CASE_FIXTURE(Fixture, "indexing_on_string_singletons")
{
CheckResult result = check(R"(
local a: string = "hi"
if a == "hi" then
local x = a:byte()
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("hi")", toString(requireTypeAtPosition({3, 22})));
}
TEST_CASE_FIXTURE(Fixture, "indexing_on_union_of_string_singletons")
{
CheckResult result = check(R"(
local a: string = "hi"
if a == "hi" or a == "bye" then
local x = a:byte()
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("bye" | "hi")", toString(requireTypeAtPosition({3, 22})));
}
TEST_CASE_FIXTURE(Fixture, "taking_the_length_of_string_singleton")
{
CheckResult result = check(R"(
local a: string = "hi"
if a == "hi" then
local x = #a
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("hi")", toString(requireTypeAtPosition({3, 23})));
}
TEST_CASE_FIXTURE(Fixture, "taking_the_length_of_union_of_string_singleton")
{
CheckResult result = check(R"(
local a: string = "hi"
if a == "hi" or a == "bye" then
local x = #a
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(R"("bye" | "hi")", toString(requireTypeAtPosition({3, 23})));
}
TEST_CASE_FIXTURE(Fixture, "no_widening_from_callsites")
{
CheckResult result = check(R"(
type Direction = "North" | "East" | "West" | "South"
local function direction(): Direction
return "North"
end
local d: Direction = direction()
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_SUITE_END();
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