From e961a16a52d619f263c9909c447ce0908b2accf9 Mon Sep 17 00:00:00 2001
From: Sainan <sainan@calamity.inc>
Date: Sat, 8 Feb 2025 23:17:49 +0100
Subject: [PATCH] Improve error message for in expression `"abc" in nil` now
 says that the second operand could also be a string

---
 src/lvm.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/lvm.cpp b/src/lvm.cpp
index bc9ec4b72..447344538 100644
--- a/src/lvm.cpp
+++ b/src/lvm.cpp
@@ -869,7 +869,10 @@ static void inopr (lua_State *L, StkId ra, TValue *a, TValue *b) {
     }
   } else {
     if (l_unlikely(!ttistable(b))) {
-      luaG_runerror(L, "expected second 'in' operand to be table, got %s", ttypename(ttype(b)));
+      if (ttisstring(a))
+        luaG_runerror(L, "expected second 'in' operand to be table or string, got %s", ttypename(ttype(b)));
+      else
+        luaG_runerror(L, "expected second 'in' operand to be table, got %s", ttypename(ttype(b)));
     } else {
       if (luaV_searchelement(L, hvalue(b), a)) {
         setbtvalue(s2v(ra));