Fwd: proper tail calls?

["Nathan Linger" <nathan.linger@...>]

Oops, here is the code.

---------- Forwarded message ----------
From: Nathan Linger <nathan.linger@gmail.com>
Date: Mar 10, 2006 4:16 PM
Subject: proper tail calls?
To: Lua list <lua@bazar2.conectiva.com.br>


>From an enthusiastic new Lua programmer,

I wrote a simple little package for lazy evaluation consisting of just
two functions, delay and force.
I then wrote a simple test program to try it out.  It constructs and
traverses an infinite stream, printing out its elements.
I wrote the test program in two styles, procedural and functional.

Due to Lua's proper tail recursion, I expected the two to be
operationally equivalent, but the functional version causes a stack
overflow!
All the code is attached at the end.

What am I to make of this?  A bug in my program or in Lua?  Just to
clarify, I'm using Lua 5.0.2.

Nathan

Attachment: thunk.lua
Description: Binary data