Here's my guess:

c:\@Work\Perl>perl -wMstrict -le
"use List::MoreUtils qw(any);
 ;;
 sub myfunc { return map { int rand 10 } 1 .. $_[0]; }
 ;;
 my @List_new;
 ;;
 UNTIL_TRUE: {
   @List_new = myfunc(7);
   any { $_ == 3 } @List_new or redo UNTIL_TRUE;
   }
 ;;
 print qq{@List_new};
"
0 1 6 1 8 1 3
[download]

Notes:

• List::MoreUtils::any() can be replaced with the built-in grep for short lists (for some definition of "short").
• any() may also be found in List::Util in later versions of Perl.
• The label UNTIL_TRUE is not needed, it's just documentary.

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