From 9cbf17b0f1bb4001b237c4027b271f0db9bde62c Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 11 Sep 2018 08:39:12 -0300
Subject: Details (comments)

---
 lapi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lapi.c')

diff --git a/lapi.c b/lapi.c
index 0ca9a321..ae6b07ae 100644
--- a/lapi.c
+++ b/lapi.c
@@ -38,7 +38,11 @@ const char lua_ident[] =
 
 
 
-/* test for a valid index */
+/*
+** Test for a valid index.
+** '!ttisnil(o)' implies 'o != &G(L)->nilvalue', so it is not needed.
+** However, it covers the most common cases in a faster way.
+*/
 #define isvalid(L, o)	(!ttisnil(o) || o != &G(L)->nilvalue)
 
 
-- 
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