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{   package Foo;
    # Foo stuff
...
    # This function is main::MainFunc.
}

package Foo;
{    # Foo stuff
...
package main;

# back in main.

#!/usr/bin/perl
use strict;
...
print "Foo::Bar: ", Foo::Bar->method, "\n";
print "Foo:      ", Foo->method, "\n";