On Jan 23, 2021, at 1:06 PM, jayrturne...@gmail.com wrote:

> I want to wrap expert_add_info calls so that I can check the expert_field* 
> argument, see if the severity is PI_ERROR, and set a generated field in my 
> protocol that says “this packet has errors”.

For what purpose?

There's already something in the protocol tree saying "this packet has errors", 
namely the added expert info.

A packet-matching expression that will match all packets that have a PI_ERROR 
expert info is

        _ws.expert.severity == "Error"

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