[HACKERS] pg_sequences bug ?

Hi hackers,
I tried a committed pg_sequences for PostgreSQL 10dev (https://commitfest.postgresql.org/12/771/).
I found that when multiple users create SEQUENCE, I cannot see the pg_sequences catalog. I think that should work just
likepg_tables. 

$ psql -U user1
postgres=> CREATE SEQUENCE seq1 ;
CREATE SEQUENCE

$ psql -U user2
postgres=> CREATE SEQUENCE seq2 ;
CREATE SEQUENCE
postgres=> SELECT * FROM pg_sequences ;
ERROR:  permission denied for sequence seq1

Apparently it seems that the pg_sequence_last_value function included in the pg_sequences view definition cannot be
executed.
Is this behavior supposed?

Snapshot: https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.gz 2017-02-04 00:29:04
Operating System: Red Hat Enterprise Linux 7 Update 2 (x86-64)

Regards.