From 048234f2ceaad1801473bf8a95219d08797b5e9d Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Sat, 6 May 2017 11:04:05 +1000
Subject: Initialise CClosure upvalues TValues in constructor

---
 src/lapi.js    | 3 ++-
 src/lobject.js | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/lapi.js b/src/lapi.js
index 97cb061..89297cc 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -280,7 +280,8 @@ const lua_pushcclosure = function(L, fn, n) {
 
         L.top -= n;
         while (n--) {
-            cl.upvalue[n] = L.stack[L.top + n];
+            cl.upvalue[n].setfrom(L.stack[L.top + n])
+            L.stack[L.top + n] = void 0;
         }
 
         L.stack[L.top] = new TValue(CT.LUA_TCCL, cl);
diff --git a/src/lobject.js b/src/lobject.js
index ab50af8..e4ef380 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -197,6 +197,9 @@ class CClosure {
         this.f = f;
         this.nupvalues = n;
         this.upvalue = new Array(n); /* list of upvalues as TValues */
+        while (n--) {
+            this.upvalue[n] = new TValue(CT.LUA_TNIL, null);
+        }
     }
 
 }
-- 
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