The error magnet.no-part

user: the script can change it: the error says what happened in the experiment’s names, and what to write instead.

On the refusal list: no test names this code, since no file under tests/ names it. A test may still raise it without naming it, and none asserts it: what its message and action say is read from the source below. The hook that records which codes a test raises has not landed, so until it does the list says names and never raises. The list (docs/ratchets/refusal_codes.txt) only shrinks.

Where MIME gives it, with what its message says happened and what its action says to do ({…} is filled in from the experiment):

• in mime/build/_plan.py:

  • what happened: body {…} declares parts, and its magnet {…} is not among them: its moment is derived from its parts

  • what to do: declare the magnet's part: parts={{…}: Part(...)}

Reading an error and reaching its full traceback: reading an error. Every code: the index.