use strict;

require lib;
lib::->import(
    sub {
        my ($self, $filename) = @_;
        lib::->unimport($self); # Enable require below.

        require Benchmark; # Some module that exists, just as demo.

        lib::->import($self); # Put it back in business.

        my $rc = 1;
        return sub {
            $_ = 1 if $rc;
            return $rc--;
        };
    }
);

print "Trying to require some modules that doesn't exist, ";

require This::Does::Not::Exist;
require Cwd;
require This::Does::Not::Exist::Either;

print "and it worked.\n";

__END__
Trying to require some modules that doesn't exist, and it worked.