Trace class:
  Stream class (ID 0):
    Supports packets: Yes
    Packets have beginning default clock snapshot: No
    Packets have end default clock snapshot: No
    Supports discarded events: No
    Supports discarded packets: No
    Event class `ev` (ID 0):
      Payload field class: Structure (1 member):
        s: String

{Trace 0, Stream class ID 0, Stream ID 0}
Stream beginning:
  Trace `the-trace`:
    Stream (ID 0, Class ID 0)

{Trace 0, Stream class ID 0, Stream ID 0}
Packet beginning

{Trace 0, Stream class ID 0, Stream ID 0}
Event `ev` (Class ID 0):
  Payload:
    s: hello

{Trace 0, Stream class ID 0, Stream ID 0}
Event `ev` (Class ID 0):
  Payload:
    s: how are you?

{Trace 0, Stream class ID 0, Stream ID 0}
Event `ev` (Class ID 0):
  Payload:
    s: I'm fine, you?

{Trace 0, Stream class ID 0, Stream ID 0}
Packet end

{Trace 0, Stream class ID 0, Stream ID 0}
Stream end