temp tables broken in CVS HEAD?

Against current CVS HEAD:

$ ./createuser test
Shall the new user be allowed to create databases? (y/n) y
Shall the new user be allowed to create more new users? (y/n) n
CREATE USER
$ ./createdb -O test test
CREATE DATABASE
$ ./psql -U test test
Welcome to psql 7.5devel, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms       \h for help with SQL commands       \? for help with psql commands
\gor terminate with semicolon to execute query       \q to quit
 

test=> \l       List of databases   Name    | Owner  | Encoding
-----------+--------+----------- template0 | oliver | SQL_ASCII template1 | oliver | SQL_ASCII test      | test   |
SQL_ASCII
(3 rows)

test=> create table t1 (i int);
CREATE TABLE
test=> create temp table t2 (i integer);
ERROR:  permission denied for schema pg_temp_1

test=> select * from pg_namespace;      nspname       | nspowner |             nspacl
--------------------+----------+--------------------------------- pg_toast           |        1 | pg_temp_1          |
     1 | pg_catalog         |        1 | {oliver=U*C*/oliver,=U/oliver} public             |        1 |
{oliver=U*C*/oliver,=UC/oliver}information_schema |        1 | {oliver=U*C*/oliver,=U/oliver}
 
(5 rows)

The same thing under 7.4.2 successfully creates the temp table. I think 
this is something recent as it's triggered by the JDBC driver's 
regression tests, which ran (under the same conditions IIRC) without 
problems against CVS HEAD as of about a week ago.

-O