if ($DEBUG) {
    print STDERR "Debug: some value";
    # some tempory line to debug our debuger ...
    # some other temp line ...
}
[download]

I think that Perlers have a (probably appropriate) inclination against do blocks; but of course one can (as jkva points out below) have the multi-line cake and eat it too (or something):

do {
     print STDERR "Debug:  some value";
     # some temporary line
     # some other temporary line
} if $DEBUG;
[download]

Of course, a trailing modifier after 17 lines of code isn't going to do anything for readability; but I think that do this; that if DEBUG is still reasonably English-like. As an added bonus, it's easy to transform a do-with-trailing-if to a leading if when the block gets too big and readability suffers.

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