struct Foo {
	a int 
} 

fn test_array_str() {
	f := Foo{34}
	println(f) 
	//s := f.str() 
	//println(s) 
	n := [i64(1), 2, 3] 
	assert n.str() == '[1, 2, 3]' 
	println(n)  // make sure the array is printable 
	n2 := [4,5,6] 
	assert n2.str() == '[4, 5, 6]' 
	println(n2) 
}