Helper A library provided some useful proc macros for Rust. Macros control flow either: Ternary operator in many C-like languages. collections btmap: Create std::collections::BTreeMap from list of key-value pairs. btset: Create a std::collections::BTreeSet from a list of elements. hmap: Create std::collections::HashMap from list of key-value pairs. hset: Create a std::collections::HashSet from a list of elements. License MulanPSL-2.0