my $usage = "This is just a literal string concat'd up; " . "it keeps significant\n" . "whitespace and interpolations in normal or " . $visible . "places. Double-quotes seem most convenient " . "just to contain simple things like newlines " . "and tabs.\n" . "But the important thing is that the dots " . "make it easy to see that each line starts\n" . "a new token\n";