OP_MODPRINC
assert(opcode != OP_ADDPRINC && opcode != OP_MODPRINC);
assert(opcode == OP_ADDPRINC || opcode == OP_MODPRINC);
} else if (opcode == OP_MODPRINC && h->vt.modprinc != NULL) {
!stub_auth_restrict(handle, OP_MODPRINC, rec.principal, &arg->rec,