[
  {"edition": "2015", "release_date": "2015-05-15", "key_features": "First edition (Rust 1.0): ownership and borrowing, traits, pattern matching, zero-cost abstractions, no GC; std library and Cargo"},
  {"edition": "2018", "release_date": "2018-12-06", "key_features": "Rust 2018 edition: module system revamp (paths, use, pub(crate)); dyn syntax; impl Trait; async/await (stabilized in 1.39)"},
  {"edition": "2021", "release_date": "2021-10-21", "key_features": "Rust 2021 edition: closures capture disjoint fields; IntoIterator for arrays; const generics MVP; format strings capture identifiers"},
  {"edition": "2024", "release_date": "2025-02-20", "key_features": "Rust 2024 edition: new impl Trait lifetime capture rules; unsafe extern blocks and bodies; gen blocks; tighter static and extern semantics"}
]