Hello, Sergey,

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Also, please add here comment about `sizeof(buff) - 1` too.

Please add a comment that the terminating '\0' is considered by parser
as part of the input, so we must chomp it.

Updated:

--- a/test/tarantool-c-tests/lj-1168-unmarked-finalizer-tab.test.c
+++ b/test/tarantool-c-tests/lj-1168-unmarked-finalizer-tab.test.c
@@ -89,6 +89,10 @@ unmarked_finalizer_tab_gcmark(void *test_state)
        /* Not trigger GC during `lua_openffi()`. */
        lua_gc(L, LUA_GCSTOP, 0);
 
+       /*
+        * The terminating '\0' is considered by parser as part of
+        * the input, so we must chomp it.
+        */
        int res = luaL_loadbufferx(L, buff, sizeof(buff) - 1,
                                   "test_chunk", "t");
        if (res != LUA_OK) {

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