Turn CHECK failure that depends on file system state into an error message and include what failed in the error.
Turn CHECK failure that depends on file system state into an error message
and include what failed in the error.

google/kati,google/kati,google/kati,danw/kati,danw/kati,google/kati,danw/kati,danw/kati,google/kati,danw/kati,danw/kati