[HACKERS] DROP TABLE hangs because of same table foreign key

[Louis-David Mitterrand]

Hi,

On 7.2.1 debian-unstable PG hangs when trying to drop a table which
contains a field referencing another field in the same table as a
foreign key. 

Is it legal/orhtodox to use a "references" on another field of the same
table?
 
Strangely after restarting PG the drop succeeds without hanging.

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