[Cthulhu_]

I hate (read: love) to be pedantic, but all scripting languages already have this feature built-in, and thanks to modern VMs and JIT compilers and the like, performance is much less of an issue.

It would be interesting to see e.g. a Go executable format that ships with the source, build tools and documentation that would compile to the current platform on demand. Should be doable in a Docker image at least.