update filename before appending file debug info

src/codegen.c

@@ -2449,6 +2449,7 @@ scope_finish(codegen_scope *s)
   irep->pool = (mrb_value *)codegen_realloc(s, irep->pool, sizeof(mrb_value)*irep->plen);
   irep->syms = (mrb_sym *)codegen_realloc(s, irep->syms, sizeof(mrb_sym)*irep->slen);
   if (s->filename) {
+    s->irep->filename = mrb_parser_get_filename(s->parser, s->filename_index);
     mrb_debug_info_append_file(mrb, s->irep, s->debug_start_pos, s->pc);
 
     fname_len = strlen(s->filename);