The error post-build.underived-input

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.

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/_checks.py:

  • what happened: the graph declares an external input {…}.{…} that no write of the controller derives: nothing would feed it, and MADDENING would fill it with zeros

  • what to do: (none)

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