constant rejected in router id ...

[Kai]

Good Morning!

When trying to use a previously defined constant value in a "router id", bird answers with a syntax error. Is this the intended behaviour? It would be quite handy to be able to use constants in this place also (as we have a multi-ASN-setup using the router-id-override within template-bgp-blocks).
Example:
  define my_router_id = 10.11.12.13;
  router id my_router_id;

Best regards, Kai