From: Keith Packard <keithp@keithp.com>
Date: Fri, 1 Dec 2017 10:32:27 +0000 (+0100)
Subject: altos/lisp: return from unmatched cond is #f, not nil
X-Git-Tag: 1.8.3~1^2~32
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=5d0b85f25fa1e5cc816a8256afb38cf9552f6d9d

altos/lisp: return from unmatched cond is #f, not nil

Fix the return value when we fall off the end of a cond expression to
be #f

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

diff --git a/src/lisp/ao_lisp_eval.c b/src/lisp/ao_lisp_eval.c
index 1044aa48..fa25edf0 100644
--- a/src/lisp/ao_lisp_eval.c
+++ b/src/lisp/ao_lisp_eval.c
@@ -350,7 +350,7 @@ ao_lisp_eval_cond(void)
 	DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
 	DBGI(".. saved frame "); DBG_POLY(ao_lisp_stack->frame); DBG("\n");
 	if (!ao_lisp_stack->sexprs) {
-		ao_lisp_v = AO_LISP_NIL;
+		ao_lisp_v = _ao_lisp_bool_false;
 		ao_lisp_stack->state = eval_val;
 	} else {
 		ao_lisp_v = ao_lisp_poly_cons(ao_lisp_stack->sexprs)->car;