blob: 6d2aee1479d8635ae5400e961930cde3addbc856 [file] [log] [blame]
// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace test {
macro ElementsKindTestHelper1(kind: constexpr ElementsKind): bool {
if constexpr ((kind == UINT8_ELEMENTS) || (kind == UINT16_ELEMENTS)) {
return true;
} else {
return false;
}
}
macro ElementsKindTestHelper2(kind: constexpr ElementsKind): constexpr bool {
return ((kind == UINT8_ELEMENTS) || (kind == UINT16_ELEMENTS));
}
macro LabelTestHelper1(): never
labels Label1 {
goto Label1;
}
macro LabelTestHelper2(): never
labels Label2(Smi) {
goto Label2(42);
}
macro LabelTestHelper3(): never
labels Label3(Oddball, Smi) {
goto Label3(Null, 7);
}
@export
macro TestConstexpr1() {
check(FromConstexpr<bool>(IsFastElementsKind(PACKED_SMI_ELEMENTS)));
}
@export
macro TestConstexprIf() {
check(ElementsKindTestHelper1(UINT8_ELEMENTS));
check(ElementsKindTestHelper1(UINT16_ELEMENTS));
check(!ElementsKindTestHelper1(UINT32_ELEMENTS));
}
@export
macro TestConstexprReturn() {
check(FromConstexpr<bool>(ElementsKindTestHelper2(UINT8_ELEMENTS)));
check(FromConstexpr<bool>(ElementsKindTestHelper2(UINT16_ELEMENTS)));
check(!FromConstexpr<bool>(ElementsKindTestHelper2(UINT32_ELEMENTS)));
check(FromConstexpr<bool>(!ElementsKindTestHelper2(UINT32_ELEMENTS)));
}
@export
macro TestGotoLabel(): Boolean {
try {
LabelTestHelper1() otherwise Label1;
}
label Label1 {
return True;
}
}
@export
macro TestGotoLabelWithOneParameter(): Boolean {
try {
LabelTestHelper2() otherwise Label2;
}
label Label2(smi: Smi) {
check(smi == 42);
return True;
}
}
@export
macro TestGotoLabelWithTwoParameters(): Boolean {
try {
LabelTestHelper3() otherwise Label3;
}
label Label3(o: Oddball, smi: Smi) {
check(o == Null);
check(smi == 7);
return True;
}
}
builtin GenericBuiltinTest<T: type>(_c: Context, _param: T): Object {
return Null;
}
GenericBuiltinTest<Object>(_c: Context, param: Object): Object {
return param;
}
@export
macro TestBuiltinSpecialization(c: Context) {
check(GenericBuiltinTest<Smi>(c, 0) == Null);
check(GenericBuiltinTest<Smi>(c, 1) == Null);
check(GenericBuiltinTest<Object>(c, Undefined) == Undefined);
check(GenericBuiltinTest<Object>(c, Undefined) == Undefined);
}
macro LabelTestHelper4(flag: constexpr bool): never
labels Label4, Label5 {
if constexpr (flag) {
goto Label4;
} else {
goto Label5;
}
}
macro CallLabelTestHelper4(flag: constexpr bool): bool {
try {
LabelTestHelper4(flag) otherwise Label4, Label5;
}
label Label4 {
return true;
}
label Label5 {
return false;
}
}
@export
macro TestPartiallyUnusedLabel(): Boolean {
const r1: bool = CallLabelTestHelper4(true);
const r2: bool = CallLabelTestHelper4(false);
if (r1 && !r2) {
return True;
} else {
return False;
}
}
macro GenericMacroTest<T: type>(_param: T): Object {
return Undefined;
}
GenericMacroTest<Object>(param2: Object): Object {
return param2;
}
macro GenericMacroTestWithLabels<T: type>(_param: T): Object
labels _X {
return Undefined;
}
GenericMacroTestWithLabels<Object>(param2: Object): Object
labels Y {
return Cast<Smi>(param2) otherwise Y;
}
@export
macro TestMacroSpecialization() {
try {
const _smi0: Smi = 0;
check(GenericMacroTest<Smi>(0) == Undefined);
check(GenericMacroTest<Smi>(1) == Undefined);
check(GenericMacroTest<Object>(Null) == Null);
check(GenericMacroTest<Object>(False) == False);
check(GenericMacroTest<Object>(True) == True);
check((GenericMacroTestWithLabels<Smi>(0) otherwise Fail) == Undefined);
check((GenericMacroTestWithLabels<Smi>(0) otherwise Fail) == Undefined);
try {
GenericMacroTestWithLabels<Object>(False) otherwise Expected;
}
label Expected {}
}
label Fail {
unreachable;
}
}
builtin TestHelperPlus1(_context: Context, x: Smi): Smi {
return x + 1;
}
builtin TestHelperPlus2(_context: Context, x: Smi): Smi {
return x + 2;
}
@export
macro TestFunctionPointers(implicit context: Context)(): Boolean {
let fptr: builtin(Context, Smi) => Smi = TestHelperPlus1;
check(fptr(context, 42) == 43);
fptr = TestHelperPlus2;
check(fptr(context, 42) == 44);
return True;
}
@export
macro TestVariableRedeclaration(implicit context: Context)(): Boolean {
let _var1: int31 = FromConstexpr<bool>(42 == 0) ? 0 : 1;
let _var2: int31 = FromConstexpr<bool>(42 == 0) ? 1 : 0;
return True;
}
@export
macro TestTernaryOperator(x: Smi): Smi {
const b: bool = x < 0 ? true : false;
return b ? x - 10 : x + 100;
}
@export
macro TestFunctionPointerToGeneric(c: Context) {
const fptr1: builtin(Context, Smi) => Object = GenericBuiltinTest<Smi>;
const fptr2: builtin(Context, Object) => Object =
GenericBuiltinTest<Object>;
check(fptr1(c, 0) == Null);
check(fptr1(c, 1) == Null);
check(fptr2(c, Undefined) == Undefined);
check(fptr2(c, Undefined) == Undefined);
}
type ObjectToObject = builtin(Context, Object) => Object;
@export
macro TestTypeAlias(x: ObjectToObject): BuiltinPtr {
return x;
}
@export
macro TestUnsafeCast(implicit context: Context)(n: Number): Boolean {
if (TaggedIsSmi(n)) {
const m: Smi = UnsafeCast<Smi>(n);
check(TestHelperPlus1(context, m) == 11);
return True;
}
return False;
}
@export
macro TestHexLiteral() {
check(Convert<intptr>(0xffff) + 1 == 0x10000);
check(Convert<intptr>(-0xffff) == -65535);
}
@export
macro TestLargeIntegerLiterals(implicit c: Context)() {
let _x: int32 = 0x40000000;
let _y: int32 = 0x7fffffff;
}
@export
macro TestMultilineAssert() {
const someVeryLongVariableNameThatWillCauseLineBreaks: Smi = 5;
check(
someVeryLongVariableNameThatWillCauseLineBreaks > 0 &&
someVeryLongVariableNameThatWillCauseLineBreaks < 10);
}
@export
macro TestNewlineInString() {
Print('Hello, World!\n');
}
const kConstexprConst: constexpr int31 = 5;
const kIntptrConst: intptr = 4;
const kSmiConst: Smi = 3;
@export
macro TestModuleConstBindings() {
check(kConstexprConst == Int32Constant(5));
check(kIntptrConst == 4);
check(kSmiConst == 3);
}
@export
macro TestLocalConstBindings() {
const x: constexpr int31 = 3;
const xSmi: Smi = x;
{
const x: Smi = x + FromConstexpr<Smi>(1);
check(x == xSmi + 1);
const xSmi: Smi = x;
check(x == xSmi);
check(x == 4);
}
check(xSmi == 3);
check(x == xSmi);
}
struct TestStructA {
indexes: FixedArray;
i: Smi;
k: Number;
}
struct TestStructB {
x: TestStructA;
y: Smi;
}
@export
macro TestStruct1(i: TestStructA): Smi {
return i.i;
}
@export
macro TestStruct2(implicit context: Context)(): TestStructA {
return TestStructA{
indexes: UnsafeCast<FixedArray>(kEmptyFixedArray),
i: 27,
k: 31
};
}
@export
macro TestStruct3(implicit context: Context)(): TestStructA {
let a: TestStructA =
TestStructA{indexes: UnsafeCast<FixedArray>(kEmptyFixedArray), i: 13, k: 5};
let _b: TestStructA = a;
const c: TestStructA = TestStruct2();
a.i = TestStruct1(c);
a.k = a.i;
let d: TestStructB;
d.x = a;
d = TestStructB{x: a, y: 7};
let _e: TestStructA = d.x;
let f: Smi = TestStructA{
indexes: UnsafeCast<FixedArray>(kEmptyFixedArray),
i: 27,
k: 31
}.i;
f = TestStruct2().i;
return a;
}
struct TestStructC {
x: TestStructA;
y: TestStructA;
}
@export
macro TestStruct4(implicit context: Context)(): TestStructC {
return TestStructC{x: TestStruct2(), y: TestStruct2()};
}
macro TestStructInLabel(implicit context: Context)(): never labels
Foo(TestStructA) {
goto Foo(TestStruct2());
}
@export // Silence unused warning.
macro CallTestStructInLabel(implicit context: Context)() {
try {
TestStructInLabel() otherwise Foo;
}
label Foo(_s: TestStructA) {}
}
// This macro tests different versions of the for-loop where some parts
// are (not) present.
@export
macro TestForLoop() {
let sum: Smi = 0;
for (let i: Smi = 0; i < 5; ++i) sum += i;
check(sum == 10);
sum = 0;
let j: Smi = 0;
for (; j < 5; ++j) sum += j;
check(sum == 10);
sum = 0;
j = 0;
for (; j < 5;) sum += j++;
check(sum == 10);
// Check that break works. No test expression.
sum = 0;
for (let i: Smi = 0;; ++i) {
if (i == 5) break;
sum += i;
}
check(sum == 10);
sum = 0;
j = 0;
for (;;) {
if (j == 5) break;
sum += j;
j++;
}
check(sum == 10);
// The following tests are the same as above, but use continue to skip
// index 3.
sum = 0;
for (let i: Smi = 0; i < 5; ++i) {
if (i == 3) continue;
sum += i;
}
check(sum == 7);
sum = 0;
j = 0;
for (; j < 5; ++j) {
if (j == 3) continue;
sum += j;
}
check(sum == 7);
sum = 0;
j = 0;
for (; j < 5;) {
if (j == 3) {
j++;
continue;
}
sum += j;
j++;
}
check(sum == 7);
sum = 0;
for (let i: Smi = 0;; ++i) {
if (i == 3) continue;
if (i == 5) break;
sum += i;
}
check(sum == 7);
sum = 0;
j = 0;
for (;;) {
if (j == 3) {
j++;
continue;
}
if (j == 5) break;
sum += j;
j++;
}
check(sum == 7);
j = 0;
try {
for (;;) {
if (++j == 10) goto Exit;
}
}
label Exit {
check(j == 10);
}
// Test if we can handle uninitialized values on the stack.
let _i: Smi;
for (let j: Smi = 0; j < 10; ++j) {
}
}
@export
macro TestSubtyping(x: Smi) {
const _foo: Object = x;
}
macro IncrementIfSmi<A: type>(x: A): A {
typeswitch (x) {
case (x: Smi): {
return x + 1;
}
case (o: A): {
return o;
}
}
}
type NumberOrFixedArray = Number | FixedArray;
macro TypeswitchExample(implicit context: Context)(x: NumberOrFixedArray):
int32 {
let result: int32 = 0;
typeswitch (IncrementIfSmi(x)) {
case (_x: FixedArray): {
result = result + 1;
}
case (Number): {
result = result + 2;
}
}
result = result * 10;
typeswitch (IncrementIfSmi(x)) {
case (x: Smi): {
result = result + Convert<int32>(x);
}
case (a: FixedArray): {
result = result + Convert<int32>(a.length);
}
case (_x: HeapNumber): {
result = result + 7;
}
}
return result;
}
@export
macro TestTypeswitch(implicit context: Context)() {
check(TypeswitchExample(FromConstexpr<Smi>(5)) == 26);
const a: FixedArray = AllocateZeroedFixedArray(3);
check(TypeswitchExample(a) == 13);
check(TypeswitchExample(FromConstexpr<Number>(0.5)) == 27);
}
@export
macro TestTypeswitchAsanLsanFailure(implicit context: Context)(obj: Object) {
typeswitch (obj) {
case (_o: Smi): {
}
case (_o: JSTypedArray): {
}
case (_o: JSReceiver): {
}
case (_o: HeapObject): {
}
}
}
macro ExampleGenericOverload<A: type>(o: Object): A {
return o;
}
macro ExampleGenericOverload<A: type>(o: Smi): A {
return o + 1;
}
@export
macro TestGenericOverload(implicit context: Context)() {
const xSmi: Smi = 5;
const xObject: Object = xSmi;
check(ExampleGenericOverload<Smi>(xSmi) == 6);
check(UnsafeCast<Smi>(ExampleGenericOverload<Object>(xObject)) == 5);
}
@export
macro TestEquality(implicit context: Context)() {
const notEqual: bool =
AllocateHeapNumberWithValue(0.5) != AllocateHeapNumberWithValue(0.5);
check(!notEqual);
const equal: bool =
AllocateHeapNumberWithValue(0.5) == AllocateHeapNumberWithValue(0.5);
check(equal);
}
macro BoolToBranch(x: bool): never
labels Taken, NotTaken {
if (x) {
goto Taken;
} else {
goto NotTaken;
}
}
@export
macro TestOrAnd1(x: bool, y: bool, z: bool): bool {
return BoolToBranch(x) || y && z ? true : false;
}
@export
macro TestOrAnd2(x: bool, y: bool, z: bool): bool {
return x || BoolToBranch(y) && z ? true : false;
}
@export
macro TestOrAnd3(x: bool, y: bool, z: bool): bool {
return x || y && BoolToBranch(z) ? true : false;
}
@export
macro TestAndOr1(x: bool, y: bool, z: bool): bool {
return BoolToBranch(x) && y || z ? true : false;
}
@export
macro TestAndOr2(x: bool, y: bool, z: bool): bool {
return x && BoolToBranch(y) || z ? true : false;
}
@export
macro TestAndOr3(x: bool, y: bool, z: bool): bool {
return x && y || BoolToBranch(z) ? true : false;
}
@export
macro TestLogicalOperators() {
check(TestAndOr1(true, true, true));
check(TestAndOr2(true, true, true));
check(TestAndOr3(true, true, true));
check(TestAndOr1(true, true, false));
check(TestAndOr2(true, true, false));
check(TestAndOr3(true, true, false));
check(TestAndOr1(true, false, true));
check(TestAndOr2(true, false, true));
check(TestAndOr3(true, false, true));
check(!TestAndOr1(true, false, false));
check(!TestAndOr2(true, false, false));
check(!TestAndOr3(true, false, false));
check(TestAndOr1(false, true, true));
check(TestAndOr2(false, true, true));
check(TestAndOr3(false, true, true));
check(!TestAndOr1(false, true, false));
check(!TestAndOr2(false, true, false));
check(!TestAndOr3(false, true, false));
check(TestAndOr1(false, false, true));
check(TestAndOr2(false, false, true));
check(TestAndOr3(false, false, true));
check(!TestAndOr1(false, false, false));
check(!TestAndOr2(false, false, false));
check(!TestAndOr3(false, false, false));
check(TestOrAnd1(true, true, true));
check(TestOrAnd2(true, true, true));
check(TestOrAnd3(true, true, true));
check(TestOrAnd1(true, true, false));
check(TestOrAnd2(true, true, false));
check(TestOrAnd3(true, true, false));
check(TestOrAnd1(true, false, true));
check(TestOrAnd2(true, false, true));
check(TestOrAnd3(true, false, true));
check(TestOrAnd1(true, false, false));
check(TestOrAnd2(true, false, false));
check(TestOrAnd3(true, false, false));
check(TestOrAnd1(false, true, true));
check(TestOrAnd2(false, true, true));
check(TestOrAnd3(false, true, true));
check(!TestOrAnd1(false, true, false));
check(!TestOrAnd2(false, true, false));
check(!TestOrAnd3(false, true, false));
check(!TestOrAnd1(false, false, true));
check(!TestOrAnd2(false, false, true));
check(!TestOrAnd3(false, false, true));
check(!TestOrAnd1(false, false, false));
check(!TestOrAnd2(false, false, false));
check(!TestOrAnd3(false, false, false));
}
@export
macro TestCall(i: Smi): Smi labels A {
if (i < 5) return i;
goto A;
}
@export
macro TestOtherwiseWithCode1() {
let v: Smi = 0;
let s: Smi = 1;
try {
TestCall(10) otherwise goto B(++s);
}
label B(v1: Smi) {
v = v1;
}
assert(v == 2);
}
@export
macro TestOtherwiseWithCode2() {
let s: Smi = 0;
for (let i: Smi = 0; i < 10; ++i) {
TestCall(i) otherwise break;
++s;
}
assert(s == 5);
}
@export
macro TestOtherwiseWithCode3() {
let s: Smi = 0;
for (let i: Smi = 0; i < 10; ++i) {
s += TestCall(i) otherwise break;
}
assert(s == 10);
}
@export
macro TestForwardLabel() {
try {
goto A;
}
label A {
goto B(5);
}
label B(b: Smi) {
assert(b == 5);
}
}
@export
macro TestQualifiedAccess(implicit context: Context)() {
const s: Smi = 0;
check(!array::IsJSArray(s));
}
@export
macro TestCatch1(implicit context: Context)(): Smi {
let r: Smi = 0;
try {
ThrowTypeError(kInvalidArrayLength);
} catch (_e) {
r = 1;
return r;
}
}
@export
macro TestCatch2Wrapper(implicit context: Context)(): never {
ThrowTypeError(kInvalidArrayLength);
}
@export
macro TestCatch2(implicit context: Context)(): Smi {
let r: Smi = 0;
try {
TestCatch2Wrapper();
} catch (_e) {
r = 2;
return r;
}
}
@export
macro TestCatch3WrapperWithLabel(implicit context: Context)():
never labels _Abort {
ThrowTypeError(kInvalidArrayLength);
}
@export
macro TestCatch3(implicit context: Context)(): Smi {
let r: Smi = 0;
try {
TestCatch3WrapperWithLabel() otherwise Abort;
}
label Abort {
return -1;
}
catch (_e) {
r = 2;
return r;
}
}
// This test doesn't actually test the functionality of iterators,
// it's only purpose is to make sure tha the CSA macros in the
// IteratorBuiltinsAssembler match the signatures provided in
// iterator.tq.
@export
macro TestIterator(implicit context: Context)(o: JSReceiver, map: Map) {
try {
const t1: Object = iterator::GetIteratorMethod(o);
const t2: iterator::IteratorRecord = iterator::GetIterator(o);
const _t3: Object = iterator::IteratorStep(t2) otherwise Fail;
const _t4: Object = iterator::IteratorStep(t2, map) otherwise Fail;
const t5: Object = iterator::IteratorValue(o);
const _t6: Object = iterator::IteratorValue(o, map);
const _t7: JSArray = iterator::IterableToList(t1, t1);
iterator::IteratorCloseOnException(t2, t5);
}
label Fail {}
}
@export
macro TestFrame1(implicit context: Context)() {
const f: Frame = LoadFramePointer();
const frameType: FrameType =
Cast<FrameType>(f.context_or_frame_type) otherwise unreachable;
assert(frameType == STUB_FRAME);
assert(f.caller == LoadParentFramePointer());
typeswitch (f) {
case (_f: StandardFrame): {
unreachable;
}
case (_f: ArgumentsAdaptorFrame): {
unreachable;
}
case (_f: StubFrame): {
}
}
}
@export
macro TestNew(implicit context: Context)() {
const f: JSArray = NewJSArray();
check(f.IsEmpty());
f.length = 0;
}
struct TestInner {
SetX(newValue: int32) {
this.x = newValue;
}
GetX(): int32 {
return this.x;
}
x: int32;
y: int32;
}
struct TestOuter {
a: int32;
b: TestInner;
c: int32;
}
@export
macro TestStructConstructor(implicit context: Context)() {
// Test default constructor
let a: TestOuter = TestOuter{a: 5, b: TestInner{x: 6, y: 7}, c: 8};
check(a.a == 5);
check(a.b.x == 6);
check(a.b.y == 7);
check(a.c == 8);
a.b.x = 1;
check(a.b.x == 1);
a.b.SetX(2);
check(a.b.x == 2);
check(a.b.GetX() == 2);
}
class InternalClass extends Struct {
Flip() labels NotASmi {
const tmp = Cast<Smi>(this.b) otherwise NotASmi;
this.b = this.a;
this.a = tmp;
}
a: Smi;
b: Number;
}
macro NewInternalClass(x: Smi): InternalClass {
return new InternalClass{a: x, b: x + 1};
}
@export
macro TestInternalClass(implicit context: Context)() {
const o = NewInternalClass(5);
o.Flip() otherwise unreachable;
check(o.a == 6);
check(o.b == 5);
}
struct StructWithConst {
TestMethod1(): int32 {
return this.b;
}
TestMethod2(): Object {
return this.a;
}
a: Object;
const b: int32;
}
@export
macro TestConstInStructs() {
const x = StructWithConst{a: Null, b: 1};
let y = StructWithConst{a: Null, b: 1};
y.a = Undefined;
const _copy = x;
check(x.TestMethod1() == 1);
check(x.TestMethod2() == Null);
}
struct TestIterator {
Next(): Object labels NoMore {
if (this.count-- == 0) goto NoMore;
return TheHole;
}
count: Smi;
}
@export
macro TestNewFixedArrayFromSpread(implicit context: Context)(): Object {
let i = TestIterator{count: 5};
return new FixedArray{map: kFixedArrayMap, length: 5, objects: ...i};
}
class SmiPair extends Struct {
GetA():&Smi {
return & this.a;
}
a: Smi;
b: Smi;
}
macro Swap<T: type>(a:&T, b:&T) {
const tmp = * a;
* a = * b;
* b = tmp;
}
@export
macro TestReferences() {
const array = new SmiPair{a: 7, b: 2};
const ref:&Smi = & array.a;
* ref = 3 + * ref;
-- * ref;
Swap(& array.b, array.GetA());
check(array.a == 2);
check(array.b == 9);
}
@export
macro TestStaticAssert() {
StaticAssert(1 + 2 == 3);
}
class SmiBox extends Struct {
value: Smi;
unrelated: Smi;
}
builtin NewSmiBox(implicit context: Context)(value: Smi): SmiBox {
return new SmiBox{value, unrelated: 0};
}
@export
macro TestLoadEliminationFixed(implicit context: Context)() {
const box = NewSmiBox(123);
const v1 = box.value;
box.unrelated = 999;
const v2 = (box.unrelated == 0) ? box.value : box.value;
StaticAssert(WordEqual(v1, v2));
box.value = 11;
const v3 = box.value;
const eleven: Smi = 11;
StaticAssert(WordEqual(v3, eleven));
}
@export
macro TestLoadEliminationVariable(implicit context: Context)() {
const a = UnsafeCast<FixedArray>(kEmptyFixedArray);
const box = NewSmiBox(1);
const v1 = a.objects[box.value];
const u1 = a.objects[box.value + 2];
const v2 = a.objects[box.value];
const u2 = a.objects[box.value + 2];
StaticAssert(WordEqual(v1, v2));
StaticAssert(WordEqual(u1, u2));
}
@export
macro TestRedundantArrayElementCheck(implicit context: Context)(): Smi {
const a = kEmptyFixedArray;
for (let i: Smi = 0; i < a.length; i++) {
if (a.objects[i] == TheHole) {
if (a.objects[i] == TheHole) {
return -1;
} else {
StaticAssert(false);
}
}
}
return 1;
}
@export
macro TestRedundantSmiCheck(implicit context: Context)(): Smi {
const a = kEmptyFixedArray;
const x = a.objects[1];
typeswitch (x) {
case (Smi): {
Cast<Smi>(x) otherwise VerifiedUnreachable();
return -1;
}
case (Object): {
}
}
return 1;
}
struct SBox<T: type> {
value: T;
}
@export
macro TestGenericStruct1(): intptr {
const i: intptr = 123;
let box = SBox<intptr>{value: i};
let boxbox = SBox<SBox<intptr>>{value: box};
check(box.value == 123);
boxbox.value.value *= 2;
check(boxbox.value.value == 246);
return boxbox.value.value;
}
struct TestTuple<T1: type, T2: type> {
const fst: T1;
const snd: T2;
}
macro Swap<T1: type, T2: type>(tuple: TestTuple<T1, T2>):
TestTuple<T2, T1> {
return TestTuple<T2, T1>{fst: tuple.snd, snd: tuple.fst};
}
@export
macro TestGenericStruct2(): TestTuple<Smi, intptr> {
const intptrAndSmi = TestTuple<intptr, Smi>{fst: 1, snd: 2};
const smiAndIntptr = Swap<intptr, Smi>(intptrAndSmi);
check(intptrAndSmi.fst == smiAndIntptr.snd);
check(intptrAndSmi.snd == smiAndIntptr.fst);
return smiAndIntptr;
}
}