7.4.5 / 7.4.6 crash (pg_hba.conf issue)

I've run across a bug in pg_hba.conf routines which is repeatable in
both 32bit intel on Linux and 64bit AMD on FreeBSD with both 7.4.5 and
7.4.6. It results in the postmaster crashing which is quite annoying
when it leaves behind it's children.

create a file dev.users within the data directory such as the attached.

Edit pg_hba.conf to have a line like:
    host    db     @dev.users   127.0.0.1        255.255.255.255 trust

Hup the postmaster,.

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