11 beta 3 / ROLLBACK TO SAVEPOINT regression in PLPGSQL

This routine works well on postgres v10:

CREATE FUNCTION test_savepoint() RETURNS VOID AS $body$

BEGIN

  SAVEPOINT my_savepoint;

  ROLLBACK TO my_savepoint;

END $body$ LANGUAGE plpgsql;

The same code can not be compiled in postgres v11 beta 3, I got error:

[42601] ERROR: syntax error at or near "TO"

Position: 117

Best regards

David Klika