18:01:50Bikei found... maybe a bug, in how reconstruct works.
18:02:26Bikeif you have a cst for e.g. (cond (a b)), which macroexpands to (if a b nil) or so, if you reconstruct the latter you'll find that the nil has no source info, even if you reconstructed with :default-source
18:02:56Bikebecause reconstruct finds the list-ending NIL in the original cst, which has no source because of how the cst reader works, and uses that