When no stream is explicitly selected, msg() uses the default stream, which
has registration number 0 and which is also returned by log_default_stream().
This stream has no explicit destination, but it can have substreams. (When
When no stream is explicitly selected, msg() uses the default stream, which
has registration number 0 and which is also returned by log_default_stream().
This stream has no explicit destination, but it can have substreams. (When