Clutch pedal...my bad

One of the 2 bolts that fastened the slave cylinder to the gearbox fell out.  This caused the cylinder to rotate on one bolt and the piston in the cylinder came out and all the hydraulic fluid behind it leaked out.  No pressure to engage the clutch. 
The reason the bolt fell out was it had been fastened with a lock washer, should have been drilled and safety wired.  This was on the list back in 2010. 

The red arrow is pointing at the missing bolt hole.  The cylinder should be horizontal, not vertical.

Piston on top.