iOS with player setting "Script Call Optimization" set to "Fast but no Exceptions" running on Mono backend catches null exceptions and calls AppDomain.UnhandledException, which allows apps to trigger crash reports. IL2CPP catches the exception and ignores it.

To reproduce:
1) Create new project with script:
void OnGUI() {
if (GUILayout.Button("CRASH", GUILayout.Width(300.0f), GUILayout.Height(200.0f))) {
object o = null;
o.ToString();
}
}
2) In player settings set:
* "Script Call Optimization" to "Fast but no Exceptions".
* "On .Net UnhandledException" to "Crash".
3) Build and upload app to device.
4) Run app without Xcode attached.
5) Click "Crash" button.

Result: app keeps running.
Expected: app crashes, and inspecting generated crash log through Xcode's Devices tool should show CrashedCheckBellowForHintsWhy() being last on the callstack.