import std.stdio;

void callDelegate(void delegate() cb) {
	cb();
}

void writeEx(Throwable o) {
	writefln("%s", o);
}

void works1() {
	Throwable o2;
	try {
		throw(new Exception("This is an error"));
	} catch (Throwable o) {
		o2 = o;
		callDelegate({
			writefln("%s", o2);
		});
	}
}

void works2() {
	try {
		throw(new Exception("This is an error"));
	} catch (Throwable o) {
		writeEx(o);
	}
}

void do_not_work() {
	try {
		throw(new Exception("This is an error"));
	} catch (Throwable o) {
		callDelegate({
			writefln("%s", o);
		});
	}
}

int main(string[] args) {
	works1();
	works2();
	do_not_work();
	return 0;
}