6    $renderer = 
$DIC->ui()->renderer();
 
    8    $i = 
$f->icon()->standard(
'NONE', 
'DummyIcon');
 
    9    $default_icons = 
$i->getAllStandardHandles();
 
   12    foreach ($default_icons as $icon) {
 
   13        $i = 
$f->icon()->standard($icon, $icon, 
'medium')->withIsOutlined(
true);
 
   14        $buffer[] = $renderer->render(
$i)
 
   19    return implode(
'<br><br>', $buffer);
 
An exception for terminatinating execution or to throw for unit testing.