message: forgot to adjust error messages
diff: @@ -16,17 +16,17 @@ CREATE SEQUENCE seq
  statement error
  CREATE INDEX i1 ON t1((get_current_timestamp()), c1);
  ----
  -Binder Error: Index keys cannot contain the "get_current_timestamp" function.
  +Index keys cannot contain expressions with side effects.
  statement error
  CREATE INDEX i1 ON t1((random()), c1);
  ----
  -Binder Error: Index keys cannot contain the "random" function.
  +Index keys cannot contain expressions with side effects.
  statement error
  CREATE INDEX i1 ON t1((nextval('seq')), c1);
  ----
  -Binder Error: Index keys cannot contain the "nextval" function.
  +Index keys cannot contain expressions with side effects.
  statement ok
  DELETE FROM t1;
  @@ -36,7 +36,7 @@ DELETE FROM t1;
  statement error
  CREATE INDEX i1 ON t1((get_current_timestamp()), c1);
  ----
  -Binder Error: Index keys cannot contain the "get_current_timestamp" function.
  +Index keys cannot contain expressions with side effects.
  # but attempting to insert a value borks it up
  statement ok
  @@ -47,7 +47,7 @@ restart
  statement error
  CREATE INDEX i1 ON t1((get_current_timestamp()), c1);
  ----
  -Binder Error: Index keys cannot contain the "get_current_timestamp" function.
  +Index keys cannot contain expressions with side effects.
  statement ok
  INSERT INTO t1 VALUES (42, 'hello')
  