The extern-boundary refusal and a restart-case one each had a run of spaces mid-sentence where an OCaml line continuation had been lost. The textures lane found the first while reading the FFI rules; the second was mine, from the same editing mistake in the same week. The restart-case one turned out to be unreachable as well. Each clause is checked with the type the form has already settled on, so a clause that disagrees is refused by expect where it is written - the dedicated message could only have fired if that check did not, and it does. Removed rather than reworded; a message nothing can produce is worse than no message, because the next person tries to work out what reaches it.
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