Crate

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

I. develop the crate

Step 1: create the default crate

mkdir lib-hello && cd lib-hello
cargo init --name trait_exerci --lib

Step 2: develop the crate source and test codes

• Go to Crate Root Path

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

mkdir examples
touch examples/hello.rs
vi examples/hello.rs
cargo run --example hello