use Perl

...did you call it 'some_method'. has is not sub. It's a nice red herring though, throwing me off completely till I saw rjbs's answer. If it'd been called "some_field", it'd been obvious.

rjbs has explained what went wrong, but I'm curious why you'd expect it to behave differently. The behaviour is exactly as documented in Moose's section on is => 'rw'|'ro'.

Ah, that makes "sense" (and it was that gotcha that had gotten me). Sigh. JINP.

If memory serves, Self had a system to make any slot a parent-slot - by convention "parent*" was the object cloned from, but any slot could be a parent-slot by adding a * to the name. How dispatch was eventually (mis-)handled, I have no recollection...

NewtonScript was based on Self, but extended the convention to always have two parent-slots for gui-elements (business-object + gui-object), but not any more, as I recall.

And speaking of prototype-based language, why would anyone add first-order functions to a language and not make them closures. Yes, javascript, I'm looking at you.

ObUsePerlSucks: adding my own paragraphs? really?