Crate

• crate name: modtraitexerci
• folder name: lib-hello
• description: how to understand the rust feature trait with mod

I. develop the crate

Step 1: create the default crate

bash mkdir lib-hello && cd lib-hello cargo init --name mod_trait_exerci --lib

Step 2: develop the crate source and test codes

• Go to Crate Root Path bash vi Cargo.toml vi src/lib.rs cargo fmt cargo clippy # warning: struct is never constructed: `MyType` mkdir tests touch tests/hello.rs vi tests/hello.rs touch tests/mod_hello.rs vi tests/mod_hello.rs cargo fmt cargo clippy cargo test

Step 3: develop the example codes

• Go to Crate Root Path bash mkdir examples touch examples/hello.rs vi examples/hello.rs cargo run --example hello