Function varinfo

3rd/lua-5.4.3/src/ldebug.c:678–689

static const char *varinfo (lua_State *L, const TValue *o) {
  const char *name = NULL;  /* to avoid warnings */
  CallInfo *ci = L->ci;
  const char *kind = NULL;
  if (isLua(ci)) {
    kind = getupvalname(ci, o, &name);  /* check whether 'o' is an upvalue */
    if (!kind && isinstack(ci, o))  /* no? try a register */
      kind = getobjname(ci_func(ci)->p, currentpc(ci),
                        cast_int(cast(StkId, o) - (ci->func + 1)), &name);
  }
  return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
}


l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {