While playing with prepared statements in psql, I noticed that EXECUTEtab-completes the list of active prepared statements, but DEALLOCATEdoes not.
Attached is a patch to fix this.
-- "I use RMS as a guide in the same way that a boat captain would use a lighthouse. It's good to know where it is, but you generally don't want to find yourself in the same spot." - Tollef Fog Heen