Adding Rust FFI into Vale, in particular the part where the Vale compiler determines the signature and proper overload of a Rust function.

Our ultimate goal is to write this Vale code:

 vale

    
import rust.std.vec.Vec;

exported func main() {
  vec = Vec<int>.with_capacity(42);
  println("Length: " + vec.capacity());
}


  

 stdout

    
Length: 42

  

...which would successfully make a Rust Vec and call capacity on it.

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