run without modification. More often, examples will consist
of a snippet of code containing only the "important" bits.
The definition of "important" varies from snippet to snippet.
-Sometimes it's important to declare C<use strict;> and C<use warnings;>,
+Sometimes it's important to declare C<use strict> and C<use warnings>,
initialize all variables and fully catch every error condition.
More often than not, though, those things obscure the lesson
the example was intended to teach.