Here's another ugly but working way to do it:
my %switch;
@switch{1..10} = (qw(L1 L2 L3 L4 L5 L6 L7 L8 L9 L10));
goto END_SWITCH unless exists $switch{$var};
goto $switch{$var};
L10: print "a" ;
L9: print "b" ;
L8: print "c" ;
L7: print "d" ;
L6: print "e" ;
L5: print "f" ;
L4: print "g" ;
L3: print "h" ;
L2: print "i" ;
L1: print "j" ;
END_SWITCH: # whatever
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