$ perl -Mwarnings -Mdiagnostics -e '@array = (1,2,3); print defined(@array)'
defined(@array) is deprecated at -e line 1 (#1)
    (D deprecated) defined() is not usually useful on arrays because it
    checks for an undefined scalar value.  If you want to see if the
    array is empty, just use if (@array) { # not empty } for example.