in lib/src/stack_zone_specification.dart [121:128]
ZoneUnaryCallback<R, T> _registerUnaryCallback<R, T>(
Zone self, ZoneDelegate parent, Zone zone, R Function(T) f) {
if (_disabled) return parent.registerUnaryCallback(zone, f);
var node = _createNode(1);
return parent.registerUnaryCallback(zone, (arg) {
return _run(() => f(arg), node);
});
}