I feel I am getting over the hump of learning rust now and coding in rust is becoming less frustrating for me.

However, one thing that slows me down is the lack of indices in the documentation. For instance, if I want to know the return type of a vector len() I go here:

https://doc.rust-lang.org/std/vec/struct.Vec.html

.. and then I have to search the web page for all instances of "len". It would be good if there was an index similar to Javadoc, Godoc or Doxygen.

There might be a good reason for not having the index, but as a beginner it is lost on me.