$ echo Value of glob construct can be "0"; test with defined() at perl
+.pl line 65.  |splain
Value of glob construct can be "0"; test with defined() at perl.pl lin
+e 65.   (#1)
    (W misc) In a conditional expression, you used <HANDLE>, <*> (glob
+),
    each(), or readdir() as a boolean value.  Each of these constructs
    can return a value of "0"; that would make the conditional express
+ion
    false, which is probably not what you intended.  When using these
    constructs in conditional expressions, test their values with the
    defined operator.
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