Add Chapter 3: Traits & Generics#2
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Maps Python's try/except/None to Rust's Result<T,E>, Option<T>, and the ? operator. Covers custom error types, Option chaining, iterator collect into Result, and the LBYL/EAFP/types comparison. 16 passing example tests, 5 exercises with todo!() stubs. Also fixes ch01 Logger exercise: replaced todo!() in Drop impl with a comment-only stub to avoid double-panic abort in the test runner. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Maps Python's ABCs/Protocols/duck typing to Rust's trait system. Covers trait definition and implementation, generic functions with trait bounds, default methods, derived traits, operator overloading (Add, Sub, Display), static vs dynamic dispatch, and multiple trait bounds with where clauses. 16 passing example tests, 5 exercises with todo!() stubs covering HasArea trait, generic largest_area, Display for Temperature, Add for Money, and dynamic dispatch with Renderable. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
#[derive], operator overloading (Add,Sub,Display), static vs dynamic dispatch,whereclausestodo!()stubsTest plan
cargo test -p ch03-traits-and-generics— 16/16 passcargo clippy --workspace -- -D warnings— cleancargo fmt --all -- --check— cleanDepends on #1
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