//! This library will contains common macros.
//!
//! Mainly following macros:
//!
//! - `hash_map!`,
//! - `hash_set!`,
//! - `b_tree_map!`,
//! - `b_tree_set!`,
//! - `expr_count!`
//! - `insert!` (generalization of map/set/vec insertion)
//!
//! I'm not sure if I will add common alt. assertion macros
//! (e.g. `assert_ok!`, `assert_err!`, `assert_iter_eq!`).