How is default argument before code line one?

[mardiyah]

How is way on default argument before code line one (should get worked anyway) 
? Illustrated;
    
    
    template h( foo = "", bar : untyped ) =
     echo foo
     bar
    
    h "foo" :
     echo "bar"
    
    h:
     echo "foo"
    
    Run

Please solve me out, thanks