The error slot.collision

internal: a check on MIME’s own construction, which no supported script should reach: a MIME defect, to report with the file the error names; or an error MIME raised with no code yet (error.uncoded), keeping its own class, to report so that it gets one.

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: field {…}: readers {…} and {…} map to one slot name {…}

  • what to do: MIME defect: report it with this build report.

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