CHECK evaluation error when using more than one table

Pedro Alves (pmalves(at)cosmos(dot)inesc(dot)pt) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
CHECK evaluation error when using more than one table

Long Description
Creating a table with the code shown, everytime I try to insert values I get the same "ERROR: ExecEvalExpr: unknown expression type 108"

Sample Code
CREATE TABLE ninhada (
c_id_mae int,
n_id int,
c_id_pai int,
n_dta_nasc date,
PRIMARY KEY (n_id, c_id_mae),
FOREIGN KEY (c_id_mae) REFERENCES caes (c_id)
ON DELETE CASCADE,
FOREIGN KEY (c_id_pai) REFERENCES caes (c_id)
,
CHECK (c_id_mae in
(select c.c_id from caes c where caes.c_id=c_id_mae AND c.c_sexo=0)
)
);

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