BLOCK_INPUT;
...
record_unwind_protect()
...
UNBLOCK_INPUT;
unbind_to();
I think that code is correct.
Neither record_unwind_protect nor unbind_to does anything to
interrupt_input_blocked. If there is no abnormal control transfer,
unbind_to will run the function that record_unwind_protect recorded,
and UNBLOCK_INPUT will undo the BLOCK_INPUT.
If there is an abnormal control transfer, it will run that function.
It will also restore interrupt_input_blocked to the proper value
corresponding to the place the error is caught. Which is not in this
function.
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