[Minor] Lpeg: Improve logging on type mismatch

diff --git a/contrib/lua-lpeg/lptree.c b/contrib/lua-lpeg/lptree.c
index f4a58dbf046ee811b13e6ae8d5a2326c13c2aabe..4920f8f89ae28ba94f7d01ffc99d2ac9bfb93b7d 100644 (file)
--- a/contrib/lua-lpeg/lptree.c
+++ b/contrib/lua-lpeg/lptree.c
@@ -1187,7 +1187,8 @@ static int lp_match (lua_State *L) {
 #ifdef LPEG_LUD_WORKAROUND
        lpeg_free_mem_low (capture);
 #endif
-       return luaL_error (L, "invalid argument");
+       return luaL_error (L, "invalid argument: %s",
+                       lua_typename (L, lua_type (L, SUBJIDX)));
   }
   size_t i = initposition(L, l);
   int ptop = lua_gettop(L), rs;