luau/tests/TypeInfer.generics.test.cpp

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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 "Luau/TypeInfer.h"
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#include "Luau/Type.h"
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#include "Luau/Scope.h"
#include <algorithm>
#include "Fixture.h"
#include "doctest.h"
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LUAU_FASTFLAG(LuauInstantiateInSubtyping)
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using namespace Luau;
TEST_SUITE_BEGIN("GenericsTests");
TEST_CASE_FIXTURE(Fixture, "check_generic_function")
{
CheckResult result = check(R"(
function id<a>(x:a): a
return x
end
local x: string = id("hi")
local y: number = id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "check_generic_local_function")
{
CheckResult result = check(R"(
local function id<a>(x:a): a
return x
end
local x: string = id("hi")
local y: number = id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "check_generic_typepack_function")
{
CheckResult result = check(R"(
function id<a...>(...: a...): (a...) return ... end
local x: string, y: boolean = id("hi", true)
local z: number = id(37)
id()
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "types_before_typepacks")
{
CheckResult result = check(R"(
function f<a,b...>() end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "local_vars_can_be_polytypes")
{
CheckResult result = check(R"(
local function id<a>(x:a):a return x end
local f: <a>(a)->a = id
local x: string = f("hi")
local y: number = f(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "inferred_local_vars_can_be_polytypes")
{
CheckResult result = check(R"(
local function id(x) return x end
print("This is bogus") -- TODO: CLI-39916
local f = id
local x: string = f("hi")
local y: number = f(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "local_vars_can_be_instantiated_polytypes")
{
CheckResult result = check(R"(
local function id(x) return x end
print("This is bogus") -- TODO: CLI-39916
local f: (number)->number = id
local g: (string)->string = id
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "properties_can_be_polytypes")
{
CheckResult result = check(R"(
local t = {}
t.m = function<a>(x: a):a return x end
local x: string = t.m("hi")
local y: number = t.m(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "properties_can_be_instantiated_polytypes")
{
CheckResult result = check(R"(
local t: { m: (number)->number } = { m = function(x:number) return x+1 end }
local function id<a>(x:a):a return x end
t.m = id
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "check_nested_generic_function")
{
CheckResult result = check(R"(
local function f()
local function id<a>(x:a): a
return x
end
local x: string = id("hi")
local y: number = id(37)
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "check_recursive_generic_function")
{
CheckResult result = check(R"(
local function id<a>(x:a):a
local y: string = id("hi")
local z: number = id(37)
return x
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "check_mutual_generic_functions")
{
CheckResult result = check(R"(
local id2
local function id1<a>(x:a):a
local y: string = id2("hi")
local z: number = id2(37)
return x
end
function id2<a>(x:a):a
local y: string = id1("hi")
local z: number = id1(37)
return x
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "generic_functions_in_types")
{
CheckResult result = check(R"(
type T = { id: <a>(a) -> a }
local x: T = { id = function<a>(x:a):a return x end }
local y: string = x.id("hi")
local z: number = x.id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "generic_factories")
{
CheckResult result = check(R"(
type T<a> = { id: (a) -> a }
type Factory = { build: <a>() -> T<a> }
local f: Factory = {
build = function<a>(): T<a>
return {
id = function(x:a):a
return x
end
}
end
}
local y: string = f.build().id("hi")
local z: number = f.build().id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "factories_of_generics")
{
CheckResult result = check(R"(
type T = { id: <a>(a) -> a }
type Factory = { build: () -> T }
local f: Factory = {
build = function(): T
return {
id = function<a>(x:a):a
return x
end
}
end
}
local x: T = f.build()
local y: string = x.id("hi")
local z: number = x.id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "infer_generic_function")
{
CheckResult result = check(R"(
function id(x)
return x
end
local x: string = id("hi")
local y: number = id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
TypeId idType = requireType("id");
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const FunctionType* idFun = get<FunctionType>(idType);
REQUIRE(idFun);
auto [args, varargs] = flatten(idFun->argTypes);
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auto [rets, varrets] = flatten(idFun->retTypes);
CHECK_EQ(idFun->generics.size(), 1);
CHECK_EQ(idFun->genericPacks.size(), 0);
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CHECK_EQ(follow(args[0]), follow(idFun->generics[0]));
CHECK_EQ(follow(rets[0]), follow(idFun->generics[0]));
}
TEST_CASE_FIXTURE(Fixture, "infer_generic_local_function")
{
CheckResult result = check(R"(
local function id(x)
return x
end
local x: string = id("hi")
local y: number = id(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
TypeId idType = requireType("id");
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const FunctionType* idFun = get<FunctionType>(idType);
REQUIRE(idFun);
auto [args, varargs] = flatten(idFun->argTypes);
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auto [rets, varrets] = flatten(idFun->retTypes);
CHECK_EQ(idFun->generics.size(), 1);
CHECK_EQ(idFun->genericPacks.size(), 0);
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CHECK_EQ(follow(args[0]), follow(idFun->generics[0]));
CHECK_EQ(follow(rets[0]), follow(idFun->generics[0]));
}
TEST_CASE_FIXTURE(Fixture, "infer_nested_generic_function")
{
CheckResult result = check(R"(
local function f()
local function id(x)
return x
end
local x: string = id("hi")
local y: number = id(37)
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "infer_generic_methods")
{
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ScopedFastFlag sff{"DebugLuauSharedSelf", true};
CheckResult result = check(R"(
local x = {}
function x:id(x) return x end
function x:f(): string return self:id("hello") end
function x:g(): number return self:id(37) end
)");
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if (FFlag::DebugLuauDeferredConstraintResolution)
LUAU_REQUIRE_NO_ERRORS(result);
else
{
// TODO: Quantification should be doing the conversion, not normalization.
LUAU_REQUIRE_ERRORS(result);
}
}
TEST_CASE_FIXTURE(Fixture, "calling_self_generic_methods")
{
CheckResult result = check(R"(
local x = {}
function x:id(x) return x end
function x:f()
local x: string = self:id("hi")
local y: number = self:id(37)
end
)");
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// TODO: Should typecheck but currently errors CLI-54277
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "infer_generic_property")
{
CheckResult result = check(R"(
local t = {}
t.m = function(x) return x end
local x: string = t.m("hi")
local y: number = t.m(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "function_arguments_can_be_polytypes")
{
CheckResult result = check(R"(
local function f(g: <a>(a)->a)
local x: number = g(37)
local y: string = g("hi")
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "function_results_can_be_polytypes")
{
CheckResult result = check(R"(
local function f() : <a>(a)->a
local function id<a>(x:a):a return x end
return id
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "type_parameters_can_be_polytypes")
{
CheckResult result = check(R"(
local function id<a>(x:a):a return x end
local f: <a>(a)->a = id(id)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "dont_leak_generic_types")
{
CheckResult result = check(R"(
local function f(y)
-- this will only typecheck if we infer z: any
-- so f: (any)->(any)
local z = y
local function id(x)
z = x -- this assignment is what forces z: any
return x
end
local x: string = id("hi")
local y: number = id(37)
return z
end
-- so this assignment should fail
local b: boolean = f(true)
)");
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LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "dont_leak_inferred_generic_types")
{
CheckResult result = check(R"(
local function f(y)
local z = y
local function id(x)
z = x
return x
end
local x: string = id("hi")
local y: number = id(37)
end
)");
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LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "dont_substitute_bound_types")
{
CheckResult result = check(R"(
type T = { m: <a>(a) -> T }
function f(t : T)
local x: T = t.m(37)
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "dont_unify_bound_types")
{
CheckResult result = check(R"(
type F = <a>() -> <b>(a, b) -> a
type G = <b>(b, b) -> b
local f: F = function<a>()
local x
return function<b>(y: a, z: b): a
if not(x) then x = y end
return x
end
end
-- This assignment shouldn't typecheck
-- If it does, it means we instantiated
-- f as () -> <b>(X, b) -> X, then unified X to be b
local g: G = f()
-- Oh dear, if that works then the type system is unsound
local a : string = g("not a number", "hi")
local b : number = g(5, 37)
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "mutable_state_polymorphism")
{
// Replaying the classic problem with polymorphism and mutable state in Luau
// See, e.g. Tofte (1990)
// https://www.sciencedirect.com/science/article/pii/089054019090018D.
CheckResult result = check(R"(
--!strict
-- Our old friend the polymorphic identity function
local function id(x) return x end
local a: string = id("hi")
local b: number = id(37)
-- This allows <a>(a)->a to be expressed without generic function syntax
type Id = typeof(id)
-- This function should have type
-- <a>() -> (a) -> a
-- not type
-- () -> <a>(a) -> a
local function ohDear(): Id
local y
function oh(x)
-- Returns the same x every time it's called
if not(y) then y = x end
return y
end
return oh
end
-- oh dear, f claims to polymorphic which it shouldn't be
local f: Id = ohDear()
-- the first call sets y
local a: string = f("not a number")
-- so b has value "not a number" at run time
local b: number = f(37)
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "rank_N_types_via_typeof")
{
CheckResult result = check(R"(
--!strict
local function id(x) return x end
local x: string = id("hi")
local y: number = id(37)
-- This allows <a>(a)->a to be expressed without generic function syntax
type Id = typeof(id)
-- The rank 1 restriction causes this not to typecheck, since it's
-- declared as returning a polytype.
local function returnsId(): Id
return id
end
-- So this won't typecheck
local f: Id = returnsId()
local a: string = f("hi")
local b: number = f(37)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "duplicate_generic_types")
{
CheckResult result = check(R"(
function f<a,a>(x:a):a return x end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_CASE_FIXTURE(Fixture, "duplicate_generic_type_packs")
{
CheckResult result = check(R"(
function f<a...,a...>() end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_CASE_FIXTURE(Fixture, "typepacks_before_types")
{
CheckResult result = check(R"(
function f<a...,b>() end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_CASE_FIXTURE(Fixture, "variadic_generics")
{
CheckResult result = check(R"(
function f<a>(...: a) end
type F<a> = (...a) -> ...a
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "generic_type_pack_syntax")
{
CheckResult result = check(R"(
function f<a...>(...: a...): (a...) return ... end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("f")), "<a...>(a...) -> (a...)");
}
TEST_CASE_FIXTURE(Fixture, "generic_type_pack_parentheses")
{
CheckResult result = check(R"(
function f<a...>(...: a...): any return (...) end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_CASE_FIXTURE(Fixture, "better_mismatch_error_messages")
{
CheckResult result = check(R"(
function f<T>(...: T...)
return ...
end
function g<T...>(a: T)
return a
end
)");
LUAU_REQUIRE_ERROR_COUNT(2, result);
SwappedGenericTypeParameter* fErr = get<SwappedGenericTypeParameter>(result.errors[0]);
REQUIRE(fErr);
CHECK_EQ(fErr->name, "T");
CHECK_EQ(fErr->kind, SwappedGenericTypeParameter::Pack);
SwappedGenericTypeParameter* gErr = get<SwappedGenericTypeParameter>(result.errors[1]);
REQUIRE(gErr);
CHECK_EQ(gErr->name, "T");
CHECK_EQ(gErr->kind, SwappedGenericTypeParameter::Type);
}
TEST_CASE_FIXTURE(Fixture, "reject_clashing_generic_and_pack_names")
{
CheckResult result = check(R"(
function f<a, a...>() end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
DuplicateGenericParameter* err = get<DuplicateGenericParameter>(result.errors[0]);
REQUIRE(err != nullptr);
CHECK_EQ(err->parameterName, "a");
}
TEST_CASE_FIXTURE(Fixture, "instantiation_sharing_types")
{
CheckResult result = check(R"(
function f(z)
local o = {}
o.x = o
o.y = {5}
o.z = z
return o
end
local o1 = f(true)
local x1, y1, z1 = o1.x, o1.y, o1.z
local o2 = f("hi")
local x2, y2, z2 = o2.x, o2.y, o2.z
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK(requireType("x1") != requireType("x2"));
CHECK(requireType("y1") == requireType("y2"));
CHECK(requireType("z1") != requireType("z2"));
}
TEST_CASE_FIXTURE(Fixture, "quantification_sharing_types")
{
CheckResult result = check(R"(
function f(x) return {5} end
function g(x, y) return f(x) end
local z1 = f(5)
local z2 = g(true, "hi")
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK(requireType("z1") == requireType("z2"));
}
TEST_CASE_FIXTURE(Fixture, "typefuns_sharing_types")
{
CheckResult result = check(R"(
type T<a> = { x: {a}, y: {number} }
local o1: T<boolean> = { x = {true}, y = {5} }
local x1, y1 = o1.x, o1.y
local o2: T<string> = { x = {"hi"}, y = {37} }
local x2, y2 = o2.x, o2.y
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK(requireType("x1") != requireType("x2"));
CHECK(requireType("y1") == requireType("y2"));
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "bound_tables_do_not_clone_original_fields")
{
CheckResult result = check(R"(
local exports = {}
local nested = {}
nested.name = function(t, k)
local a = t.x.y
return rawget(t, k)
end
exports.nested = nested
return exports
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(Fixture, "instantiated_function_argument_names")
{
CheckResult result = check(R"(
local function f<T, U...>(a: T, ...: U...) end
f(1, 2, 3)
)");
LUAU_REQUIRE_NO_ERRORS(result);
auto ty = findTypeAtPosition(Position(3, 0));
REQUIRE(ty);
ToStringOptions opts;
opts.functionTypeArguments = true;
CHECK_EQ(toString(*ty, opts), "(a: number, number, number) -> ()");
}
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_generic_types")
{
CheckResult result = check(R"(
type C = () -> ()
type D = <T>() -> ()
local c: C
local d: D = c
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]), R"(Type '() -> ()' could not be converted into '<T>() -> ()'; different number of generic type parameters)");
}
TEST_CASE_FIXTURE(Fixture, "error_detailed_function_mismatch_generic_pack")
{
CheckResult result = check(R"(
type C = () -> ()
type D = <T...>() -> ()
local c: C
local d: D = c
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]),
R"(Type '() -> ()' could not be converted into '<T...>() -> ()'; different number of generic type pack parameters)");
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "generic_functions_dont_cache_type_parameters")
{
CheckResult result = check(R"(
-- See https://github.com/Roblox/luau/issues/332
-- This function has a type parameter with the same name as clones,
-- so if we cache type parameter names for functions these get confused.
-- function id<Z>(x : Z) : Z
function id<X>(x : X) : X
return x
end
function clone<X, Y>(dict: {[X]:Y}): {[X]:Y}
local copy = {}
for k, v in pairs(dict) do
copy[k] = v
end
return copy
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(Fixture, "generic_functions_should_be_memory_safe")
{
CheckResult result = check(R"(
--!strict
-- At one point this produced a UAF
type T<a> = { a: U<a>, b: a }
type U<a> = { c: T<a>?, d : a }
local x: T<number> = { a = { c = nil, d = 5 }, b = 37 }
x.a.c = x
local y: T<string> = { a = { c = nil, d = 5 }, b = 37 }
y.a.c = y
)");
LUAU_REQUIRE_ERRORS(result);
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CHECK_EQ(toString(result.errors[0]),
R"(Type 'y' could not be converted into 'T<string>'
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caused by:
Property 'a' is not compatible. Type '{ c: T<string>?, d: number }' could not be converted into 'U<string>'
caused by:
Property 'd' is not compatible. Type 'number' could not be converted into 'string' in an invariant context)");
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}
TEST_CASE_FIXTURE(Fixture, "generic_type_pack_unification1")
{
CheckResult result = check(R"(
--!strict
type Dispatcher = {
useMemo: <T...>(create: () -> T...) -> T...
}
local TheDispatcher: Dispatcher = {
useMemo = function<U...>(create: () -> U...): U...
return create()
end
}
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "generic_type_pack_unification2")
{
CheckResult result = check(R"(
--!strict
type Dispatcher = {
useMemo: <T...>(create: () -> T...) -> T...
}
local TheDispatcher: Dispatcher = {
useMemo = function(create)
return create()
end
}
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "generic_type_pack_unification3")
{
CheckResult result = check(R"(
--!strict
type Dispatcher = {
useMemo: <S,T...>(arg: S, create: (S) -> T...) -> T...
}
local TheDispatcher: Dispatcher = {
useMemo = function<T,U...>(arg: T, create: (T) -> U...): U...
return create(arg)
end
}
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(Fixture, "generic_argument_count_too_few")
{
CheckResult result = check(R"(
function test(a: number)
return 1
end
function wrapper<A...>(f: (A...) -> number, ...: A...)
end
wrapper(test)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]), R"(Argument count mismatch. Function 'wrapper' expects 2 arguments, but only 1 is specified)");
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}
TEST_CASE_FIXTURE(Fixture, "generic_argument_count_too_many")
{
CheckResult result = check(R"(
function test2(a: number, b: string)
return 1
end
function wrapper<A...>(f: (A...) -> number, ...: A...)
end
wrapper(test2, 1, "", 3)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(toString(result.errors[0]), R"(Argument count mismatch. Function 'wrapper' expects 3 arguments, but 4 are specified)");
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}
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TEST_CASE_FIXTURE(Fixture, "generic_function")
{
CheckResult result = check(R"(
function id(x) return x end
local a = id(55)
local b = id(nil)
)");
LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("<a>(a) -> a", toString(requireType("id")));
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CHECK_EQ(*builtinTypes->numberType, *requireType("a"));
CHECK_EQ(*builtinTypes->nilType, *requireType("b"));
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}
TEST_CASE_FIXTURE(Fixture, "generic_table_method")
{
CheckResult result = check(R"(
local T = {}
function T:bar(i)
return i
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
TypeId tType = requireType("T");
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TableType* tTable = getMutable<TableType>(tType);
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REQUIRE(tTable != nullptr);
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REQUIRE(tTable->props.count("bar"));
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TypeId barType = tTable->props["bar"].type();
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REQUIRE(barType != nullptr);
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const FunctionType* ftv = get<FunctionType>(follow(barType));
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REQUIRE_MESSAGE(ftv != nullptr, "Should be a function: " << *barType);
std::vector<TypeId> args = flatten(ftv->argTypes).first;
TypeId argType = args.at(1);
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CHECK_MESSAGE(get<GenericType>(argType), "Should be generic: " << *barType);
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}
TEST_CASE_FIXTURE(Fixture, "correctly_instantiate_polymorphic_member_functions")
{
CheckResult result = check(R"(
local T = {}
function T:foo()
return T:bar(5)
end
function T:bar(i)
return i
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
dumpErrors(result);
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const TableType* t = get<TableType>(requireType("T"));
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REQUIRE(t != nullptr);
std::optional<Property> fooProp = get(t->props, "foo");
REQUIRE(bool(fooProp));
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const FunctionType* foo = get<FunctionType>(follow(fooProp->type()));
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REQUIRE(bool(foo));
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std::optional<TypeId> ret_ = first(foo->retTypes);
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REQUIRE(bool(ret_));
TypeId ret = follow(*ret_);
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REQUIRE_EQ(getPrimitiveType(ret), PrimitiveType::Number);
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}
/*
* We had a bug in instantiation where the argument types of 'f' and 'g' would be inferred as
* f {+ method: function(<CYCLE>): (t2, T3...) +}
* g {+ method: function({+ method: function(<CYCLE>): (t2, T3...) +}): (t5, T6...) +}
*
* The type of 'g' is totally wrong as t2 and t5 should be unified, as should T3 with T6.
*
* The correct unification of the argument to 'g' is
*
* {+ method: function(<CYCLE>): (t5, T6...) +}
*/
TEST_CASE_FIXTURE(Fixture, "instantiate_cyclic_generic_function")
{
auto result = check(R"(
function f(o)
o:method()
end
function g(o)
f(o)
end
)");
TypeId g = requireType("g");
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const FunctionType* gFun = get<FunctionType>(g);
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REQUIRE(gFun != nullptr);
auto optionArg = first(gFun->argTypes);
REQUIRE(bool(optionArg));
TypeId arg = follow(*optionArg);
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const TableType* argTable = get<TableType>(arg);
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REQUIRE(argTable != nullptr);
std::optional<Property> methodProp = get(argTable->props, "method");
REQUIRE(bool(methodProp));
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const FunctionType* methodFunction = get<FunctionType>(methodProp->type());
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REQUIRE(methodFunction != nullptr);
std::optional<TypeId> methodArg = first(methodFunction->argTypes);
REQUIRE(bool(methodArg));
REQUIRE_EQ(follow(*methodArg), follow(arg));
}
TEST_CASE_FIXTURE(Fixture, "instantiate_generic_function_in_assignments")
{
CheckResult result = check(R"(
function foo(a, b)
return a(b)
end
function bar()
local c: ((number)->number, number)->number = foo -- no error
c = foo -- no error
local d: ((number)->number, string)->number = foo -- error from arg 2 (string) not being convertable to number from the call a(b)
end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
REQUIRE(tm);
CHECK_EQ("((number) -> number, string) -> number", toString(tm->wantedType));
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if (FFlag::LuauInstantiateInSubtyping)
CHECK_EQ("<a, b...>((a) -> (b...), a) -> (b...)", toString(tm->givenType));
else
CHECK_EQ("((number) -> number, number) -> number", toString(tm->givenType));
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}
TEST_CASE_FIXTURE(Fixture, "instantiate_generic_function_in_assignments2")
{
CheckResult result = check(R"(
function foo(a, b)
return a(b)
end
function bar()
local _: (string, string)->number = foo -- string cannot be converted to (string)->number
end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
REQUIRE(tm);
CHECK_EQ("(string, string) -> number", toString(tm->wantedType));
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if (FFlag::LuauInstantiateInSubtyping)
CHECK_EQ("<a, b...>((a) -> (b...), a) -> (b...)", toString(tm->givenType));
else
CHECK_EQ("((string) -> number, string) -> number", toString(*tm->givenType));
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}
TEST_CASE_FIXTURE(Fixture, "self_recursive_instantiated_param")
{
// Mutability in type function application right now can create strange recursive types
CheckResult result = check(R"(
type Table = { a: number }
type Self<T> = T
local a: Self<Table>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Table");
}
TEST_CASE_FIXTURE(Fixture, "no_stack_overflow_from_quantifying")
{
CheckResult result = check(R"(
function _(l0:t0): (any, ()->())
end
type t0 = t0 | {}
)");
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LUAU_REQUIRE_ERRORS(result);
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std::optional<TypeId> t0 = lookupType("t0");
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REQUIRE(t0);
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CHECK_EQ("*error-type*", toString(*t0));
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auto it = std::find_if(result.errors.begin(), result.errors.end(), [](TypeError& err) {
return get<OccursCheckFailed>(err);
});
CHECK(it != result.errors.end());
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "infer_generic_function_function_argument")
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{
CheckResult result = check(R"(
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local function sum<a>(x: a, y: a, f: (a, a) -> a)
return f(x, y)
end
return sum(2, 3, function(a, b) return a + b end)
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)");
LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "infer_generic_function_function_argument_2")
{
CheckResult result = check(R"(
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local function map<a, b>(arr: {a}, f: (a) -> b)
local r = {}
for i,v in ipairs(arr) do
table.insert(r, f(v))
end
return r
end
local a = {1, 2, 3}
local r = map(a, function(a) return a + a > 100 end)
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)");
LUAU_REQUIRE_NO_ERRORS(result);
REQUIRE_EQ("{boolean}", toString(requireType("r")));
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "infer_generic_function_function_argument_3")
{
CheckResult result = check(R"(
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local function foldl<a, b>(arr: {a}, init: b, f: (b, a) -> b)
local r = init
for i,v in ipairs(arr) do
r = f(r, v)
end
return r
end
local a = {1, 2, 3}
local r = foldl(a, {s=0,c=0}, function(a, b) return {s = a.s + b, c = a.c + 1} end)
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)");
LUAU_REQUIRE_NO_ERRORS(result);
REQUIRE_EQ("{ c: number, s: number }", toString(requireType("r")));
}
TEST_CASE_FIXTURE(Fixture, "infer_generic_function_function_argument_overloaded")
{
CheckResult result = check(R"(
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local g12: (<T>(T, (T) -> T) -> T) & (<T>(T, T, (T, T) -> T) -> T)
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g12(1, function(x) return x + x end)
g12(1, 2, function(x, y) return x + y end)
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)");
LUAU_REQUIRE_NO_ERRORS(result);
result = check(R"(
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local g12: (<T>(T, (T) -> T) -> T) & (<T>(T, T, (T, T) -> T) -> T)
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g12({x=1}, function(x) return {x=-x.x} end)
g12({x=1}, {x=2}, function(x, y) return {x=x.x + y.x} end)
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)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "infer_generic_lib_function_function_argument")
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{
CheckResult result = check(R"(
local a = {{x=4}, {x=7}, {x=1}}
table.sort(a, function(x, y) return x.x < y.x end)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "do_not_infer_generic_functions")
{
CheckResult result = check(R"(
local function sum<a>(x: a, y: a, f: (a, a) -> a) return f(x, y) end
local function sumrec(f: typeof(sum))
return sum(2, 3, function(a, b) return a + b end)
end
local b = sumrec(sum) -- ok
local c = sumrec(function(x, y, f) return f(x, y) end) -- type binders are not inferred
)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
TEST_CASE_FIXTURE(Fixture, "substitution_with_bound_table")
{
CheckResult result = check(R"(
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type A = { x: number }
local a: A = { x = 1 }
local b = a
type B = typeof(b)
type X<T> = T
local c: X<B>
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)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(Fixture, "apply_type_function_nested_generics1")
{
// https://github.com/Roblox/luau/issues/484
CheckResult result = check(R"(
--!strict
type MyObject = {
getReturnValue: <V>(cb: () -> V) -> V
}
local object: MyObject = {
getReturnValue = function<U>(cb: () -> U): U
return cb()
end,
}
type ComplexObject<T> = {
id: T,
nested: MyObject
}
local complex: ComplexObject<string> = {
id = "Foo",
nested = object,
}
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "apply_type_function_nested_generics2")
{
// https://github.com/Roblox/luau/issues/484
CheckResult result = check(R"(
--!strict
type MyObject = {
getReturnValue: <V>(cb: () -> V) -> V
}
type ComplexObject<T> = {
id: T,
nested: MyObject
}
local complex2: ComplexObject<string> = nil
local x = complex2.nested.getReturnValue(function(): string
return ""
end)
local y = complex2.nested.getReturnValue(function()
return 3
end)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "quantify_functions_even_if_they_have_an_explicit_generic")
{
CheckResult result = check(R"(
function foo<X>(f, x: X)
return f(x)
end
)");
CHECK("<X, a...>((X) -> (a...), X) -> (a...)" == toString(requireType("foo")));
}
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TEST_CASE_FIXTURE(Fixture, "do_not_always_instantiate_generic_intersection_types")
{
CheckResult result = check(R"(
--!strict
type Array<T> = { [number]: T }
type Array_Statics = {
new: <T>() -> Array<T>,
}
local _Arr : Array<any> & Array_Statics = {} :: Array_Statics
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
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TEST_CASE_FIXTURE(BuiltinsFixture, "hof_subtype_instantiation_regression")
{
CheckResult result = check(R"(
--!strict
local function defaultSort<T>(a: T, b: T)
return true
end
type A = any
return function<T>(array: {T}): {T}
table.sort(array, defaultSort)
return array
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(BuiltinsFixture, "higher_rank_polymorphism_should_not_accept_instantiated_arguments")
{
ScopedFastFlag sffs[] = {
{"LuauInstantiateInSubtyping", true},
};
CheckResult result = check(R"(
--!strict
local function instantiate(f: <a>(a) -> a): (number) -> number
return f
end
instantiate(function(x: string) return "foo" end)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
auto tm1 = get<TypeMismatch>(result.errors[0]);
REQUIRE(tm1);
CHECK_EQ("<a>(a) -> a", toString(tm1->wantedType));
CHECK_EQ("<a>(string) -> string", toString(tm1->givenType));
}
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TEST_CASE_FIXTURE(Fixture, "bidirectional_checking_and_generalization_play_nice")
{
CheckResult result = check(R"(
local foo = function(a)
return a()
end
local a = foo(function() return 1 end)
local b = foo(function() return "bar" end)
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK("number" == toString(requireType("a")));
CHECK("string" == toString(requireType("b")));
}
TEST_SUITE_END();