luau/tests/TypeInfer.tryUnify.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/Scope.h"
#include "Luau/TypeInfer.h"
#include "Luau/TypeVar.h"
#include "Fixture.h"
#include "doctest.h"
LUAU_FASTFLAG(LuauQuantifyInPlace2);
using namespace Luau;
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LUAU_FASTFLAG(LuauUseCommittingTxnLog)
struct TryUnifyFixture : Fixture
{
TypeArena arena;
ScopePtr globalScope{new Scope{arena.addTypePack({TypeId{}})}};
InternalErrorReporter iceHandler;
UnifierSharedState unifierState{&iceHandler};
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Unifier state{&arena, Mode::Strict, Location{}, Variance::Covariant, unifierState};
};
TEST_SUITE_BEGIN("TryUnifyTests");
TEST_CASE_FIXTURE(TryUnifyFixture, "primitives_unify")
{
TypeVar numberOne{TypeVariant{PrimitiveTypeVar{PrimitiveTypeVar::Number}}};
TypeVar numberTwo = numberOne;
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state.tryUnify(&numberTwo, &numberOne);
CHECK(state.errors.empty());
}
TEST_CASE_FIXTURE(TryUnifyFixture, "compatible_functions_are_unified")
{
TypeVar functionOne{
TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.numberType}))}};
TypeVar functionTwo{TypeVariant{
FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({arena.freshType(globalScope->level)}))}};
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state.tryUnify(&functionTwo, &functionOne);
CHECK(state.errors.empty());
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if (FFlag::LuauUseCommittingTxnLog)
state.log.commit();
CHECK_EQ(functionOne, functionTwo);
}
TEST_CASE_FIXTURE(TryUnifyFixture, "incompatible_functions_are_preserved")
{
TypePackVar argPackOne{TypePack{{arena.freshType(globalScope->level)}, std::nullopt}};
TypeVar functionOne{
TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.numberType}))}};
TypeVar functionOneSaved = functionOne;
TypePackVar argPackTwo{TypePack{{arena.freshType(globalScope->level)}, std::nullopt}};
TypeVar functionTwo{
TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.stringType}))}};
TypeVar functionTwoSaved = functionTwo;
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state.tryUnify(&functionTwo, &functionOne);
CHECK(!state.errors.empty());
CHECK_EQ(functionOne, functionOneSaved);
CHECK_EQ(functionTwo, functionTwoSaved);
}
TEST_CASE_FIXTURE(TryUnifyFixture, "tables_can_be_unified")
{
TypeVar tableOne{TypeVariant{
TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
}};
TypeVar tableTwo{TypeVariant{
TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
}};
CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
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state.tryUnify(&tableTwo, &tableOne);
CHECK(state.errors.empty());
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if (FFlag::LuauUseCommittingTxnLog)
state.log.commit();
CHECK_EQ(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
}
TEST_CASE_FIXTURE(TryUnifyFixture, "incompatible_tables_are_preserved")
{
TypeVar tableOne{TypeVariant{
TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {typeChecker.numberType}}}, std::nullopt, globalScope->level,
TableState::Unsealed},
}};
TypeVar tableTwo{TypeVariant{
TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {typeChecker.stringType}}}, std::nullopt, globalScope->level,
TableState::Unsealed},
}};
CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
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state.tryUnify(&tableTwo, &tableOne);
CHECK_EQ(1, state.errors.size());
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if (!FFlag::LuauUseCommittingTxnLog)
state.DEPRECATED_log.rollback();
CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
}
TEST_CASE_FIXTURE(TryUnifyFixture, "members_of_failed_typepack_unification_are_unified_with_errorType")
{
CheckResult result = check(R"(
function f(arg: number) end
local a
local b
f(a, b)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("a", toString(requireType("a")));
CHECK_EQ("*unknown*", toString(requireType("b")));
}
TEST_CASE_FIXTURE(TryUnifyFixture, "result_of_failed_typepack_unification_is_constrained")
{
ScopedFastFlag sff{"LuauErrorRecoveryType", true};
CheckResult result = check(R"(
function f(arg: number) return arg end
local a
local b
local c = f(a, b)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("a", toString(requireType("a")));
CHECK_EQ("*unknown*", toString(requireType("b")));
CHECK_EQ("number", toString(requireType("c")));
}
TEST_CASE_FIXTURE(TryUnifyFixture, "typepack_unification_should_trim_free_tails")
{
CheckResult result = check(R"(
--!strict
local function f(v: number)
if v % 2 == 0 then
return true
end
end
return function()
return (f(1))
end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
if (FFlag::LuauQuantifyInPlace2)
CHECK_EQ("(number) -> boolean", toString(requireType("f")));
else
CHECK_EQ("(number) -> (boolean)", toString(requireType("f")));
}
TEST_CASE_FIXTURE(TryUnifyFixture, "variadic_type_pack_unification")
{
TypePackVar testPack{TypePack{{typeChecker.numberType, typeChecker.stringType}, std::nullopt}};
TypePackVar variadicPack{VariadicTypePack{typeChecker.numberType}};
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state.tryUnify(&testPack, &variadicPack);
CHECK(!state.errors.empty());
}
TEST_CASE_FIXTURE(TryUnifyFixture, "variadic_tails_respect_progress")
{
TypePackVar variadicPack{VariadicTypePack{typeChecker.booleanType}};
TypePackVar a{TypePack{{typeChecker.numberType, typeChecker.stringType, typeChecker.booleanType, typeChecker.booleanType}}};
TypePackVar b{TypePack{{typeChecker.numberType, typeChecker.stringType}, &variadicPack}};
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state.tryUnify(&b, &a);
CHECK(state.errors.empty());
}
TEST_CASE_FIXTURE(TryUnifyFixture, "variadics_should_use_reversed_properly")
{
CheckResult result = check(R"(
--!strict
local function f<T>(...: T): ...T
return ...
end
local x: string = f(1)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
REQUIRE(tm);
CHECK_EQ(toString(tm->givenType), "number");
CHECK_EQ(toString(tm->wantedType), "string");
}
TEST_CASE_FIXTURE(TryUnifyFixture, "cli_41095_concat_log_in_sealed_table_unification")
{
CheckResult result = check(R"(
--!strict
table.insert()
)");
LUAU_REQUIRE_ERROR_COUNT(2, result);
CHECK_EQ(toString(result.errors[0]), "No overload for function accepts 0 arguments.");
CHECK_EQ(toString(result.errors[1]), "Available overloads: ({a}, a) -> (); and ({a}, number, a) -> ()");
}
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TEST_CASE("undo_new_prop_on_unsealed_table")
{
ScopedFastFlag flags[] = {
{"LuauTableSubtypingVariance2", true},
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// This test makes no sense with a committing TxnLog.
{"LuauUseCommittingTxnLog", false},
};
// I am not sure how to make this happen in Luau code.
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TryUnifyFixture fix;
TypeId unsealedTable = fix.arena.addType(TableTypeVar{TableState::Unsealed, TypeLevel{}});
TypeId sealedTable =
fix.arena.addType(TableTypeVar{{{"prop", Property{getSingletonTypes().numberType}}}, std::nullopt, TypeLevel{}, TableState::Sealed});
const TableTypeVar* ttv = get<TableTypeVar>(unsealedTable);
REQUIRE(ttv);
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fix.state.tryUnify(sealedTable, unsealedTable);
// To be honest, it's really quite spooky here that we're amending an unsealed table in this case.
CHECK(!ttv->props.empty());
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fix.state.DEPRECATED_log.rollback();
CHECK(ttv->props.empty());
}
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TEST_CASE_FIXTURE(TryUnifyFixture, "free_tail_is_grown_properly")
{
TypePackId threeNumbers = arena.addTypePack(TypePack{{typeChecker.numberType, typeChecker.numberType, typeChecker.numberType}, std::nullopt});
TypePackId numberAndFreeTail = arena.addTypePack(TypePack{{typeChecker.numberType}, arena.addTypePack(TypePackVar{FreeTypePack{TypeLevel{}}})});
ErrorVec unifyErrors = state.canUnify(numberAndFreeTail, threeNumbers);
CHECK(unifyErrors.size() == 0);
}
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TEST_CASE_FIXTURE(TryUnifyFixture, "recursive_metatable_getmatchtag")
{
TypeVar redirect{FreeTypeVar{TypeLevel{}}};
TypeVar table{TableTypeVar{}};
TypeVar metatable{MetatableTypeVar{&redirect, &table}};
redirect = BoundTypeVar{&metatable}; // Now we have a metatable that is recursive on the table type
TypeVar variant{UnionTypeVar{{&metatable, typeChecker.numberType}}};
state.tryUnify(&metatable, &variant);
}
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TEST_CASE_FIXTURE(TryUnifyFixture, "cli_50320_follow_in_any_unification")
{
ScopedFastFlag sffs[] = {
{"LuauUseCommittingTxnLog", true},
{"LuauFollowWithCommittingTxnLogInAnyUnification", true},
};
TypePackVar free{FreeTypePack{TypeLevel{}}};
TypePackVar target{TypePack{}};
TypeVar func{FunctionTypeVar{&free, &free}};
state.tryUnify(&free, &target);
// Shouldn't assert or error.
state.tryUnify(&func, typeChecker.anyType);
}
TEST_SUITE_END();