infinite recursion detected in rules for relation "..."

Hello all,

i have a problem migrating my application from version
7.4 to 8.0. Everything is fine in 7.4 but with 8.0 i get
the following error:

infinite recursion detected in rules for relation "..."

I've been able to narrow the problem down to the
attached SQL.

I don't know wether its a bug or a "feature".

Can someone explain me this behaviour.

Thanks in advance

Sebastian
CREATE TABLE ref (
    name TEXT NOT NULL PRIMARY KEY
);

CREATE TABLE test (
    id SERIAL PRIMARY KEY,
    col1 TEXT NOT NULL UNIQUE,
    col2 TEXT NOT NULL REFERENCES ref ON UPDATE CASCADE
);

CREATE TABLE log (
    id INTEGER NOT NULL,
    col1 TEXT NOT NULL,
    col2 TEXT NOT NULL
);
CREATE OR REPLACE RULE log AS ON UPDATE TO test
    DO INSERT INTO log VALUES (OLD.id,OLD.col1,OLD.col2);

CREATE VIEW bug AS
    SELECT * FROM test;
CREATE OR REPLACE RULE upd AS ON UPDATE TO bug
    DO INSTEAD NOTHING;
CREATE OR REPLACE RULE upd_col1 AS ON UPDATE TO bug
    WHERE NEW.col1 <> OLD.col1
    DO UPDATE test SET col1 = NEW.col1 WHERE id = OLD.id;
CREATE OR REPLACE RULE upd_col2 AS ON UPDATE TO bug
    WHERE NEW.col2 <> OLD.col2
    DO UPDATE test SET col2 = NEW.col2 WHERE id = OLD.id;

INSERT INTO ref (name) VALUES ('Name');
INSERT INTO test (col1,col2) VALUES ('Test 1','Name');

UPDATE bug SET col1 = 'Test' WHERE id = 1;