Rust example?

[242816]

I'm pretty sure this fixes my use case but I'm a Rust guy so need a bit of help.

Could you expand the Rust examples in the README.md to include external function calls?

I'm guessing I will call exec in a loop and match on the result to see external function call request?

Thanks

[samuelcolvin]

Yes. In the meantime, you can look at the test_cases harness which shows how to call external functions.