def run_show_bool(obj, what=None):
val = show_onoff(obj.debugger.settings[obj.name])<EOL>if not what: what = obj.name<EOL>return obj.msg("<STR_LIT>" % (what, val))<EOL>
Generic subcommand showing a boolean-valued debugger setting.
    'obj' is generally a subcommand that has 'name' and
    'debugger.setting' attributes.