re-prove [namei] with stronger postcondition
re-prove [namei] with stronger postcondition

prove that, if [namei] returns a subdirectory, there is a valid subtree
rooted at that subdirectory's inode.

mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl