From: Charles Oliver Nutter <headius@...>
Date: 2011-01-30T13:49:41+09:00
Subject: [ruby-core:34994] Re: [Ruby 1.9-Feature#4326] Fiber should respond to call() and []

On Fri, Jan 28, 2011 at 9:28 PM, Jim Weirich <jim.weirich@gmail.com> wrote:
> I wouldn't say Knuth is wrong, but a natural language "is-a" is not always
> an indication of subtype (c.f. the square/rectangle paradox where a square
> is-a rectangle, but having square inherit separate set_width/set_height
> methods from rectangle would be wrong).

Right...so my reality 2 and your reality 4 are pretty close; mine says
that coroutines and subroutines are the same thing, but subroutines
are a specialized subset. Yours says that coroutines and subroutines
are both of the same (super)type, and so they should share in common
operations from that (super)type.

In any case, I should restate again that I really don't care if Ruby
adds call and [] on Fiber :) I just want to make sure it's not being
done for a logically inconsistent reason.

- Charlie