Can anyone explains why the first piece of code is working fine while the second is giving compilation error. Put both piece of codes in different pm files and try to compile it using perl command. The only difference in both the code snippets is order of sub-routines.
First code snippet: Package one.pm 
package one;

use strict;

sub authenticate {
  my $login = {
                uname => 'rajiv',
                pwd   => 'rajiv'
              };
  _validate($login);
}

sub _validate(){
  my ($login) = @_;

  if(($login->{uname} eq 'rajiv') && ($login->{pwd} eq 'rajiv')) {
    print "Login success";
  }
  else {
    print "Login failed";
  }
}

1;

[download]
Second code snippet: Package second.pm 
package two;

use strict;

sub _validate(){
  my ($login) = @_;

  if(($login->{uname} eq 'rajiv') && ($login->{pwd} eq 'rajiv')) {
    print "Login success";
  }
  else {
    print "Login failed";
  }
} 

sub authenticate {
  my $login = {
                uname => 'rajiv',
                pwd   => 'rajiv'
              };
  _validate($login);
}

1;

[download]
Try compiling one.pm on shell.
shell>perl one.pm
shell>

Now try compiling two.pm on shell.
shell>perl two.pm
Too many arguments for two::_validate at two.pm line 21, near "$login)"
Execution of two.pm aborted due to compilation errors.
shell>
Please notice the empty parenthesis after _validate() sub.

In reply to Strange behavior by Perl: Too many arguments for... by appu_rajiv

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