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In Listing 14-7 of Chapter 14, the
use add_one;
statement is redundant and can be removed. Before the Rust 2018 edition, this statement was required to bring theadd_one
crate into scope, so it likely got missed during refactorings from that transition.By removing this line, the code becomes more concise and reflects the current best practices for using external crates in Rust.
Issue #4186