pgcrypto: is PGP_PUB_DSA_SIGN used?

Hi hackers,

I'm trying to look how to trigger code paths under PGP_PUB_DSA_SIGN constant,
and it seems like it is a dead code in the current implementation.

Can anyone confirm this, or help me with creating a correct DSA sign-only key
with RSA encryption subkey that would trigger the code paths?

Pavel