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main,U:\develsv\ARTS\playground\callertest.pl,16,main::f,1,,,,2,UUUUUU
+UUUUU

 perl -lwe 'sub a{print((caller 0)[3])};sub b{a()};sub c{b()}; c'

 perl -lwe 'sub a{print((caller 1)[3])};sub b{a()};sub c{b()}; c'

 perl -lwe 'sub a{print((caller 2)[3])};sub b{a()};sub c{b()}; c'

 perl -lwe 'sub a{print((caller 3)[3])};sub b{a()};sub c{b()}; c'