Bug in FOREIGN KEY

This problem with foreign keys has been reported to me, and I have confirmed
the bug exists in current sources.  The DELETE should succeed:

---------------------------------------------------------------------------

CREATE TABLE primarytest2 (                          col1 INTEGER,                           col2 INTEGER,
            PRIMARY KEY(col1, col2)                         );
 

CREATE TABLE foreigntest2 (col3 INTEGER,                           col4 INTEGER,                          FOREIGN KEY
(col3,col4) REFERENCES primarytest2                        );
 
test=> BEGIN;
BEGIN
test=> INSERT INTO primarytest2 VALUES (5,5);
INSERT 27618 1
test=> DELETE FROM primarytest2 WHERE col1 = 5 AND col2 = 5;
ERROR:  triggered data change violation on relation "primarytest2"

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