how is that possible

After a typo, I've just noticed the following :

~ 14:58:33: createdb test
CREATE DATABASE
~ 14:58:42: psql test
Welcome to psql 8.1.2, the PostgreSQL interactive terminal.

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

test=# create table t1 (i int primary key);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "t1_pkey" for table "t1"
CREATE TABLE
test=# create table t2 (i int references t2 1 on deley te cascade on update cascade
);
CREATE TABLE
test=# insert into t2 values (default);
INSERT 0 1
test=# select * from t1;
i
---
(0 rows)

test=# select * from t2;
i
---

(1 row)

test=# \q

should'nt the insert fail or have I mised something?
postgresql 812 unixware 7.1.4
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