Stray leading + removed.  Probably droppings from manually patching from the old CVS repo.
Removed line improperly clearing keep_silent.  From cbb8983.
It looks like Roger Firth did it back in 2004 in the old CVS repo
https://github.com/DavidGriffith/inform-2006/commit/7bc4bf3
I have no idea what he was thinking when he added that line.