Strange seg fault

[gedaiu]

Hi,

Can anyone help me why this code goes wrong? I get exit code 139 
with DMD 2.063


import std.stdio;



struct Test {
	string val = "";
	string[] key;
	
	/**
	 * operator "=" overload
	 */
	Test opAssign(string val){
		this.val = val;
		
		string[1] t;
		t = val;
		
		key ~= t;
		
		return this;
	}
	
	Test opAssign(Test val){
		this.val = val.val;
		
		key ~= val.key;
		
		return this;
	}
	
	void append(Test t) {
		val ~= t.val;
		key ~= t.key;
	};
}

void main() {
	
	Test val;
	val = "test";
	
	Test[string] data;
	Test v;
	v = "asd";
	data["test"] = v;
	
	writeln(v);
	writeln(data["test"]);
	
	data["test"].append(val);
	
	
	writeln(data["test"].key);
	writeln("done");
}

Thanks,
Bogdan