From 877fca875a92c01089ca0697e1aeecb1ff37708e Mon Sep 17 00:00:00 2001
From: Case Duckworth
Date: Sun, 31 Mar 2024 22:14:31 -0500
Subject: Error on unbound variables

I still need to catch errors!
---
 eval.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/eval.lua b/eval.lua
index 714c67e..2e3a2bf 100644
--- a/eval.lua
+++ b/eval.lua
@@ -103,6 +103,9 @@ m.specials.def = m.specials.define
 function m.eval (x, env)
 	local env = env or core.env
 	if type.isa(x, "symbol") then
+		if env[x] == nil then
+			error(string.format("Unbound variable: %s", x))
+		end
 		return env[x]
 	elseif not type.islist(x) then
 		return x
-- 
cgit 1.4.1-21-gabe81