That's a good one.

It's a wonderful example of indirect object syntax. See The Bag'o'Tricks.
Use B::Deparse shows what happens:
Update: Rather

perl -MO=Deparse

shows what happens:

sub FOO::new {
    package FOO;
    use strict 'refs';
    
}
sub FOO::try {
    package FOO;
    use strict 'refs';
    print "Trying...?\n";
}
use strict 'refs';
do {
    'FOO'->new
}->try;
[download]

As you see, the

do { 'FOO'->new }
[download]

gives you the object, which you can happily call a method on ;-)

Kay