I wasn't able to tell what the problem is here, but this code reliably reproduces it in AngelScript 2.31.0:

funcdef void f();
class foo {
	void opAssign(f@ &in) {}
}
void main() {
	foo bar = main;
}

Only happens with operator overloads.

Thanks. I'll look into this.

I've fixed this in revision 2301.

In this case the assert was correct. The if-condition was wrong. Funcdefs should fall in the first case, since they cannot be copied and only an extra handle should be created to guarantee the lifetime of the function during the call.