variable you won’t use yet, such as when you’re prototyping or just starting a
project. In this situation, you can tell Rust not to warn you about the unused
variable by starting the name of the variable with an underscore. In Listing
-18-20, we create two unused variables, but when we run this code, we should
+18-20, we create two unused variables, but when we compile this code, we should
only get a warning about one of them.
<span class="filename">Filename: src/main.rs</span>