I want a language for safe collaboration. Suppose I create a GPL-licensed library for decoding mpeg4 that I publish somewhere. Someone should be able to fix a bug in that library and publish a new with minimal involvement from my side and minimal overhead work. I shouldn't have to review pull requests or anything. It should all be automatic and the language should protect against malicious users inserting flawed code.

Copyright would be handled using a block chain so every commit's author would be publicly visible to users of the library.

The "source code" would be stored as a call-flow graph and perhaps nodes would have different permissions to sandbox the effect of untrusted contributors changes.