Closed
Description
It seems like one of the recent fix to macro handling of doc comments (perhaps this) was a bit overzealous in not parsing the string, so that embedded quotation marks don't get escaped. It doesn't show up unless stringify!
is called, but then it shows invalid code.
Compare the behavior of this playpen on nightly vs beta/std (ignoring the initial slashes which are due to #23812 and already fixed).