${'Hello {0}!' @ format=['World']}
${'Mary {0} a {1} lamb' @ format=['had', 'little']}
${'The ultimate answer is {0}' @ format=[42]}
${'The ultimate answer is {0}' @ format=42}
${'Placeholder is {3} {1} of {0}' @ format=['bounds', 'outside']}
${fmt @ format=['format', 'Sightly']}
${'No placeholders here' @ format=['O-Hai!']}