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P:\>perl58 -we"my $x,$y, $z;"
Parentheses missing around "my" list at -e line 1.
...
Useless use of a variable in void context at -e line 1.
Name "main::y" used only once: possible typo at -e line 1.
Name "main::z" used only once: possible typo at -e line 1.

my($x); 
$y;
$z;

P:\>perl58 -mO=Deparse,-p -we" my $name,$serial,$maxlen,$flags,$fstype
+;"
Parentheses missing around "my" list at -e line 1.
...
BEGIN { $^W = 1; }
(my($name), $serial, $maxlen, $flags, $fstype);
-e syntax OK