altos/lisp: Start rewriting eval as state machine
authorKeith Packard <keithp@keithp.com>
Fri, 4 Nov 2016 23:31:34 +0000 (16:31 -0700)
committerKeith Packard <keithp@keithp.com>
Fri, 18 Nov 2016 06:18:39 +0000 (22:18 -0800)
Ad-hoc code was incomprehensible and I couldn't make 'cond' work, so
I'm starting over.

Signed-off-by: Keith Packard <keithp@keithp.com>

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