> corelist -a File::Basename

File::Basename  was first released with perl 5
  5          undef
  5.001      undef
  5.002      undef
  5.00307    2.4
  5.004      2.5
  5.00405    2.6
  5.005      2.6
  5.00503    2.6
  5.00504    2.6
  5.006      2.6
  5.006001   2.6
  5.006002   2.6
  5.007003   2.71
  5.008      2.71
  5.008001   2.72
  5.008002   2.72
  5.008003   2.72
  5.008004   2.72
  5.008005   2.73
  5.008006   2.73
  5.008007   2.73
  5.008008   2.74
  5.009      2.72
  5.009001   2.72
  5.009002   2.73
  5.009003   2.74