Use `%u` instead of `%d` to dump symbol IDs.
MODIFY
src/dump.c
src/dump.c
@@ -1034,7 +1034,7 @@ dump_irep_struct(mrb_state *mrb, const mrb_irep *irep, uint8_t flags, FILE *fp,
len=irep->nlocals;
fprintf(fp, "static const struct mrb_lvinfo %s_lv_%d[%d] = {", name, n, len);
for (i=0; i+1<len; i++) {
- fprintf(fp, "{%d,%d},\n", irep->lv[i].name, irep->lv[i].r);
+ fprintf(fp, "{%u,%d},\n", irep->lv[i].name, irep->lv[i].r);
}
fputs("};\n", fp);
}

Use `%u` instead of `%d` to dump symbol IDs.