ba18b44 had the JSON layer find a line's span context through the
dispatch it was registered with, and production's logging wrapped that
layer in an Option, whose Layer impl does not pass on_register_dispatch
on: the layer never got its dispatch and every line went out without
trace_id and span_id. The log test built a subscriber of its own,
without the Option, and passed.
Both services now box their stderr layer instead of an Option of each
kind (a Box passes registration on), the formatter falls back to the
default dispatcher when it was never registered, which a global
subscriber's lines find, and the log test builds the subscriber with
the function init uses, writing to its buffer, so a wrapper like this
one is under test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RqkrVDqdiQEMWAkNGQ2tYA
rays
f5a3847a21