4) issues

---- rhino-----
>jrunscript
js> function f(){return "a"}
sun.org.mozilla.javascript.internal.InterpretedFunction@1cfa965
js> function del(){delete f}
sun.org.mozilla.javascript.internal.InterpretedFunction@1e064c
js> f()
a
js> del()
js> typeof(f)
undefined
js>

---- noshorn ------

>jrunscript
nashorn> function f(){return "a"}
function f(){return "a"}
nashorn> function del(){delete f}
function del(){delete f}
nashorn> f()
a
nashorn> del()
nashorn> typeof(f)
function
nashorn> f
function f(){return "a"}

In rhino, the "delete f" execute from within the del() function deletes the name "f"; in nashorn it does not.