I really hope to see Go and Rust move in the direction of pluggable runtimes that can be embedded into a C host program. Currently, both runtimes require being seated as the main entry-point of the program to function. Both projects also have issues in their bug trackers to rectify this:

Rust issue: https://github.com/mozilla/rust/issues/3608

Go issue: http://code.google.com/p/go/issues/detail?id=2790

I wonder who will get there first.