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When does while() test for defined vs truth

by blakem (Monsignor)
on Dec 17, 2001 at 07:01 UTC ( #132451=perlquestion: print w/ replies, xml ) Need Help??

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    #### GLOBS cause defined to show up
      # while(<*.pl>) {}         DEFINEDNESS
    ...
      # '1 while($x = <*.pl>)    TRUTHFULNESS
      % perl -MO=Deparse -e '1 while($x = <*.pl>)'
      '???' while $x = CORE::GLOBAL::glob('*.pl', 0);
    

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