Debug and DebugFormatter trait

[alex-s168]

let .debug(self: String, dbg: db+DebugFormatter): db = (
  dbg.str(self)
);

let .debug(self: User, dbg: db+DebugFormatter): db = (
  dbg.tag("User")
     .begin-struct-group()
     .field("name").kv().and(self.name)
     .field("mail").kv().and(self.mail)
     .end-struct-group()
);

[andrew-johnson-4]

Key points:

• Force debug to use a specific format so that tooling can be build to support it

[andrew-johnson-4]

From an end user how do you think they will want to write debug messages?

I was thinking something like debug( channel, event ) that way the user will provide even more information.

Channels seem like a useful pattern for pub/sub style debugging.