Why isn't this `when` expression considered exhaus...

# announcements

[bloodshura]

Why isn't this when expression considered exhaustive (i.e., compiler gives me an error about missing 'else' branch)?

when (calculated) {
	is Exception -> throw ToolException(calculated as Exception?)
	is String -> throw ToolException(calculated as String?)
	!is File -> throw ToolException("Calculated object not an instance of File?!")
}