How to handle nested record data.

I'm porting a oracle function to postgresql, which has signature like this:

FUNCTION foo
( seq IN varchar
, somerow OUT SomeTable
, otherinfo OUT varchar
)

It's easy to port this function itself to postgresql, but i have problem to
execute this function and assign the results into variables:

SELECT (foo(seq)).* INTO (v_somerow, v_otherinfo);

It complains v_somerow can not be row type.

How to handle the result of function foo?

Best regards.
YiHuang.