A builtin refused when its record is written back through event fails that write, EIO and its err, as fs.md says

A Del refused over unsaved text, written back by an event reader, said
so on the message row and answered the write ok, so the script that
wrote it could not tell. The write-back now captures failures as an
exec write does: the first one fails the write with its words and the
errno they read as.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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