Function: listkill
Section: programming/specific
C-Name: listkill
Prototype: vG
Help: listkill(L): obsolete, retained for backward compatibility.
Doc: obsolete, retained for backward compatibility. Just use \kbd{L = List()}
 instead of \kbd{listkill(L)}. In most cases, you won't even need that, e.g.
 local variables are automatically cleared when a user function returns.