From 0ad47e19d91dbfc04f890cdbbd09f7cf9f3e9d5f Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Thu, 27 Apr 2017 01:56:56 +1000
Subject: Add a couple of asserts to catch common errors

---
 src/ldo.js | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/ldo.js')

diff --git a/src/ldo.js b/src/ldo.js
index 9b845e7..fa59e0b 100644
--- a/src/ldo.js
+++ b/src/ldo.js
@@ -77,6 +77,7 @@ const luaD_precall = function(L, off, nresults) {
                 luaD_hook(L, defs.LUA_HOOKCALL, -1);
             let n = f(L); /* do the actual call */
 
+            assert(typeof n == "number" && n >= 0 && n==n|0, "invalid return value from JS function (expected integer)");
             assert(n < L.top - L.ci.funcOff, "not enough elements in the stack");
 
             luaD_poscall(L, ci, L.top - n, n);
-- 
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