Function checkrepeated

third-party/lua-5.5.0/src/lparser.c:1565–1570

** Check whether there is already a label with the given 'name' at ** current function. */

** current function.
*/
static void checkrepeated (LexState *ls, TString *name) {
  Labeldesc *lb = findlabel(ls, name, ls->fs->firstlabel);
  if (l_unlikely(lb != NULL))  /* already defined? */
    luaK_semerror(ls, "label '%s' already defined on line %d",
                      getstr(name), lb->line);  /* error */
}


static void labelstat (LexState *ls, TString *name, int line) {