CVS Head: Pg_ctl bug?

I just noticed that if I don't specify a data directory either on the
command line or in $PGDATA,, pg_ctl fails silently on Windows (haven't
been able to test other platforms atm). Is this a bug or an oversight -
an error message would seem appropriate?

/D

postgres@PC30:/usr/local/pgsql$ bin/pg_ctl start
postgres@PC30:/usr/local/pgsql$ bin/pg_ctl -D data start
postmaster starting
postgres@PC30:/usr/local/pgsql$ LOG:  database system was interrupted at
2005-08-29 00:34:07 GMT Standard Time
LOG:  checkpoint record is at 0/39F218
LOG:  redo record is at 0/39F218; undo record is at 0/0; shutdown TRUE
LOG:  next transaction ID: 1478; next OID: 16392
LOG:  next MultiXactId: 1; next MultiXactOffset: 0
LOG:  database system was not properly shut down; automatic recovery in
progress
LOG:  record with zero length at 0/39F260
LOG:  redo is not required
LOG:  database system is ready
LOG:  transaction ID wrap limit is 2147484144, limited by database
"postgres"