It is arguably more readable to save off the old value, and re-instate it if func returns undef/zero:
my $oldval;
$val = func( $oldval=$val) || $oldval;
Newer perl's allow the alternative of using the // (defined or) operator.
To maintain the challange of "not creating a new variable", one could try:
$val = func( $_=$val) || $_;
Add a BLOCK, if $_ is being abused:
$val = do{ func( local $_=$val) || $_ };
When in doubt, mumble; when in trouble, delegate; when in charge, ponder. -- James H. Boren
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