Actually, the same is true of zero: 

% perl -wce 0
-e syntax OK

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Yes, thank you, and also of undef and (), and of any list whose elements are the scalars already identified; e.g.: 

% perl -wce '( 1, 0, undef, , "di foo", "ds bar", "ig baz" )'
-e syntax OK

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Given dave_the_m's explanation above, is this to allow: 

0 until ....

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??

Reading between the lines, I gather that you are attaching some significance to the boolean value of the constant in question. I did too on a first reading, but then I realized that it is the boolean value of what follows the while or until that matters. I.e., 

1 while some_condition_with_side_effects;

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has the same effect as 
0 while some_condition_with_side_effects;

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the lowliest monk

In reply to Re^2: Why no warnings for 1 in void context? by tlm
in thread Why no warnings for 1 in void context? by tlm

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