I am unable to compile code that converts a type from an integer to a string. I'm running an example from the Rust for Rubyists tutorial which has various type conversions such as:

"Fizz".to_str() and num.to_str() (where num is an integer).

I think the majority (if not all) of these to_str() function calls have been deprecated. What is the current way to convert an integer to a string?

The errors I'm getting are:

error: type `&'static str` does not implement any method in scope named `to_str`
error: type `int` does not implement any method in scope named `to_str`