S12 is now clarified to indicate that $object.$methodname() is able to call into a closure as well as into a named method. Thanks.
"Thanks"? No, thank you! (I added a link to the quote above and I'm reporting hereafter the relevant part of the Synopsis.)
The variable may contain either the name of a method or a closure object. In the latter case the closure is called with the object as its first argument, so that a closure may be used to abstract a "navigational" path through a data structure without specifying the root of the path till later.
$locator = -> $root, $x, $y { $root.<foo>[$x]<bar>{$y}[3] }
$obj.$locator(42,"baz") # $obj<foo>[42]<bar><baz>[3]
$locator = { .<here> }
$obj.$locator # $obj<here>
