DB<162> h X
X [vars]    Same as "V currentpackage [vars]".
  DB<163> h V
V [pkg [vars]]    List some (default all) variables in package (default current).
        Use ~pattern and !pattern for positive and negative regexps.
  DB<164> h y
y [n [Vars]]   List lexicals in higher scope <n>.  Vars same as V.