Incorrectly reporting config errors

Hi all,

I'm getting a report of a config error when changing a config value
that requires a restart:

In postgresql.conf

max_connections = 92

(pg_ctl restart)

postgres=# show max_connections ;
max_connections
-----------------
92
(1 row)

(Edit postgresql.conf so that max_connections = 93)

(pg_ctl reload)

Now the log file contains:

2014-01-21 18:14:53 GMT [28718]: [4-1] user=,db=,client= LOG:
received SIGHUP, reloading configuration files
2014-01-21 18:14:53 GMT [28718]: [5-1] user=,db=,client= LOG:
parameter "max_connections" cannot be changed without restarting the
server
2014-01-21 18:14:53 GMT [28718]: [6-1] user=,db=,client= LOG:
configuration file "/home/thom/Development/data/postgresql.conf"
contains errors; unaffected changes were applied

It doesn't contain errors. I changed the 92 to 93. If I restart, it
doesn't complain, and there's nothing in the log about the config
anymore.

This seems to be the case for any parameter with a postmaster context.

I can understand why it logs the message about it not changing without
a restart, but the other one seems like a bug.

I've tested this on 9.3 and 9.4devel.

Thom