type bug?

Hello,

there is a bug with types in functions. Here is an example:

--drop type  xyz; 
create type xyz as ( x numeric,  y numeric,  z numeric );

--drop table  test_xyz ; 
create table test_xyz (  a int,  b xyz, c xyz );
insert into  test_xyz values
( 1,(11.1, 12.3, 14.5 ), (22.2, 22.3, 24.5 ) ) ;

--drop  function test_xyz() ;
create function test_xyz() returns table ( a xyz, b xyz)  as
$$
 select b, c from test_xyz ;
$$ language sql ; 

--drop   function test_xyz2() ;
create function test_xyz2() returns table ( b xyz)  as
$$
 select  b from test_xyz  ;
$$ language sql ; 

--drop   function test_xyz3() ;
create function test_xyz3() returns table ( b xyz)  as
$$
declare
  bb xyz;
  cc xyz;
begin
  select b, c into bb, cc from test_xyz ;
  return bb ;
end;  
$$ language plpgsql ; 
-- ------ 
select * from test_xyz() ; 
select * from test_xyz2() ; -- 3 columns, but 1 should be correct?
select b from test_xyz2() ; -- error
select x from test_xyz2() ; -- never declared column
select * from test_xyz3() ; -- compiling error
-- ------ 

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Franz