tuareg-interactive-filter not seeing any output?

[progman1]

tuareg-interactive--send-region sends text with comint-send-string then follows up
with comint-send-input.
the latter runs the comint-output-filter-functions hook a member of which is
tuareg-interactive-filter. which amongst other things looks for errors.

at least on my system the delay between running comint-send-string and comint-send-input
is not sufficient to see a response from the ocaml interpreter, so tuareg-interactive-filter
never sees any change in the buffer point and so never notices errors (or does anything else).

it appears comint-send-string is asynchronous so it seems odd that tuareg-interactive--send-region should even attempt to run comint-send-input afterwards.

while comint-send-input will lead to a call to tuareg-interactive-filter, comint-output-filter also does so it's noteworthy that comint uses it with set-process-filter to intercept process output synchronously. tuareg does not use this method, relying on the hook instead.
this difference, asynchronous vs synchronous handling of the output, I think accounts for the problem. what do you think?

[progman1]

ah, comint-output-filter is attached!
the problem was simply a change in the printing of compiler locations in 4.11,
"Line x, characters y-z ..." not being recognised by tuareg.

('close issue' doesn't seem to be closing the issue!)