A fairly reliable way to test if a module was loaded is to check for an associated entry in the Symbol Tables:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
package Foo;
1;
package main;
print "Data::Dumper was ", defined $Data::{'Dumper::'} ? "loaded\n" :
+"not loaded\n";
print "Foo was ", defined $::{'Foo::'} ? "loaded\n" : "not loaded\n";
print "Eata::Dumper was ", defined $Eata::{'Dumper::'} ? "loaded\n" :
+"not loaded\n";
This solution can be applied for any -M or -d. But, to the best of my understanding, the arguments themselves are lost to the ether.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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