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var cnt = 0;
var gBreak = true;
var iterObj = {
[Symbol.iterator]: function() { return iterObj; },
next: function() { cnt++; return {done: cnt > 1, value: 0}; },
};
iterObj.return = Object;
var depth = 0;
function f() {
depth++;
cnt = 0;
for (var x of iterObj) {
if (gBreak) {
break;
}
}
return 0;
}
function main() {
with ({}) {}
// Phase 1: pre-Ion, warm the break/CloseIter path (attach declines: native).
for (var i = 0; i < 60; i++) { f(); }
// Phase 2: stop executing CloseIter; let Ion compile with a fresh IC.
gBreak = false;
for (var i = 0; i < 4000; i++) { f(); }
// Phase 3: scripted return method, recursion through the Ion IC stub.
depth = 0;
gBreak = true;
iterObj.return = f;
try {
f();
print("returned normally");
} catch (e) {
print("caught: " + e.name + " at depth " + depth);
}
}
main();