Correct handling of the environment in build_signature, and throw exception for dependent arrow types.
Correct handling of the environment in build_signature, and throw
exception for dependent arrow types.


git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@11069 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq