japhy, your code is close, but will not run under use strict. I have modified your example, but again I don't see a way of getting this to work under use strict. 

use strict;

sub file_name {
  no strict 'vars';
  no strict 'refs';
  my @arg = qw(client_number MM DD S);
  for (@arg) {
    $$_ = defined($_[0]) ? shift : die "$_ not defined"
  }

  "I$client_number$MM$DD$S"
}

my $out = file_name 1,2,3,4;

warn $out;

[download]

But of course it can be improved with davorg's wonderful embellishment: 

{ local $" "I@_" }

[download]

This code reminds me of learning shorthand.

In reply to Re: Maintaining strict refs while Binding a set of variables to @_ or dying if they are not defined by princepawn
in thread Maintaining strict refs while Binding a set of variables to @_ or dying if they are not defined by princepawn

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