Renames each of the @var{count} variables in @var{vars} to the name in
the corresponding position of @var{new_names}. If the renaming would
result in a duplicate variable name, returns false and stores one of
Renames each of the @var{count} variables in @var{vars} to the name in
the corresponding position of @var{new_names}. If the renaming would
result in a duplicate variable name, returns false and stores one of