bash-3.2$ cat t4.pl 
#!/usr/bin/perl

sub foo {
   print "inside foo\n";
}

foo(
  [1..3],
  {a => 4, b => 5},
  'a' x 6,
  789,
);

bash-3.2$ perl -d t4.pl

Loading DB routines from perl5db.pl version 1.3
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(t4.pl:7):        foo(
main::(t4.pl:8):          [1..3],
main::(t4.pl:9):          {a => 4, b => 5},
main::(t4.pl:10):         'a' x 6,
main::(t4.pl:11):         789,
main::(t4.pl:12):       );
  DB<1> s
main::foo(t4.pl:4):        print "inside foo\n";
  DB<1> T
. = main::foo(ref(ARRAY), ref(HASH), 'aaaaaa', 789) called from file `
+t4.pl' line 7
  DB<1> x @DB::args
0  ARRAY(0x100812fe0)
   0  1
   1  2
   2  3
1  HASH(0x10097d318)
   'a' => 4
   'b' => 5
2  'aaaaaa'
3  789
  DB<2> q
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