struct Axx { mut: v int } 
struct Bxx {      a Axx } 
struct Cxx { mut: b Bxx }  
struct Dxx { mut: c Cxx } 
struct Exx { mut: v []int } 
struct Fxx { e []Exx }

fn test_chained_string(){
	mut b := Bxx{} b = Bxx{Axx{2}} 
	assert 'b is: ' + b.a.v.str() == 'b is: 2'
}

fn test_chained_assignments(){
  mut c := Cxx{} 
  c.b = Bxx{}
  mut d := Dxx{} 
  d.c.b = Bxx{}
  assert true
}  

fn test_chained_array_access(){
  f := Fxx{[Exx{[10,20,30]},Exx{[100,200,300,400]}]}
  assert 'f.e[0].v.len: 3' == 'f.e[0].v.len: ${f.e[0].v.len}'
  assert 'f.e[1].v.len: 4' == 'f.e[1].v.len: ${f.e[1].v.len}'
}