in lib/src/stack_zone_specification.dart [132:140]
ZoneBinaryCallback<R, T1, T2> _registerBinaryCallback<R, T1, T2>(
Zone self, ZoneDelegate parent, Zone zone, R Function(T1, T2) f) {
if (_disabled) return parent.registerBinaryCallback(zone, f);
var node = _createNode(1);
return parent.registerBinaryCallback(zone, (arg1, arg2) {
return _run(() => f(arg1, arg2), node);
});
}