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// return value in try block should not be overridden by yield in finally block.
load(libdir + "asserts.js");
// simple
function* g1() {
try {
return 42;
} finally {
yield 43;
}
}
var o = g1();
var v = o.next();
assertEq(v.done, false);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 42);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// without return value
function* g2() {
try {
return;
} finally {
yield 43;
}
}
o = g2();
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// nested try-finally
function* g3() {
try {
try {
return 42;
} finally {
try {
return 43;
} finally {
yield 44;
}
}
} finally {
yield 45;
}
}
o = g3();
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 44);
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 45);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// yield*
function* g4() {
try {
return 42;
} finally {
try {
return 43;
} finally {
yield* g5();
}
}
}
function* g5() {
yield 44;
return 45;
}
o = g4();
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 44);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// return in block scope
function* g6() {
let a = 10;
{
let a = 20;
try {
let a = 30;
{
let a = 40;
return 42;
}
} finally {
yield 43;
}
}
}
o = g6();
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 42);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// no finally
function* g7() {
try {
return 42;
} catch (e) {
yield 1;
}
}
o = g7();
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 42);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
// legacy iterator have no return value
function g8() {
try {
return;
} finally {
yield 43;
}
}
o = g8();
v = o.next();
assertEq(v, 43);
assertThrowsInstanceOf(() => o.next(), StopIteration);
// in "with" statement
options("strict");
eval(`
function* g9() {
with ({ ".genrval": { value: 44, done: false } }) {
try {
return 42;
} finally {
yield 43;
}
}
}
o = g9();
v = o.next();
assertEq(v.done, false);
assertEq(v.value, 43);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, 42);
v = o.next();
assertEq(v.done, true);
assertEq(v.value, undefined);
`);
|
