testcall1.pl:
#!/usr/bin/perl
use strict;
require "testcall2.pl";
func1 ();

testcall2.pl:
#!/usr/bin/perl
use strict;
my ($sep, $z);
sub func2 {
    print "func2: \$sep == $sep\n";
    eval '$z = sub { print "sep == ($sep)\n"; }';
    &{$z}();
}
sub func1 {
    $sep = "AB";
    func2();
}

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Calling 'perl testcall1.pl' produces output
--
func2: $sep == AB
sep == (AB)
--

Comment out the print "func2... line, then run again. Now it produces output
--
sep == ()
--

So why does that print statement change the value of $sep at a different point?

In reply to A 'print' at one spot changes a value at another by ralphmerridew

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