Are there any static duck-typed languages?

Question

Can I specify interfaces when I declare a member?

After thinking about this question for a while, it occurred to me that a static-duck-typed language might actually

Answer 1

D (http://dlang.org) is a statically compiled language and provides duck-typing via wrap() and unwrap() (http://dlang.org/phobos-prerelease/std_typecons.html#.unwrap).