pg_restore --schema always returns an empty dump

If I create a complete database dump in custom or tar format, with a
command like the following:
pg_dump -Fc dbname > db.dump

using "pg_restore db.dump", as expected, returns the entire dump.
However, "pg_restore --schema foo db.dump", where 'foo' is the name of a
schema present in the database dump always returns an empty dump.
"pg_restore --schema foo --table bar" returns the table foo.bar, though.

Does anyone know why this is?

-Nick