my @arr = ...;
sub mySub {
  goto &{ sub {  # added line
    foreach ( @arr ) {
      if ( /^PIDTAB/ ... /^\n/ ) {
        next if ( /^(PIDTAB|\n)/ );

        while ( /\s+(\d+):\s+(\d+)\s*:\S+:\S+:D\s+/g ) {
           # do something
        }
      }
    }
  }}  # added line
}

##</code><code>##

goto &{ sub {

##</code><code>##

my $dummy; goto &{ sub { $dummy if 0;