A set of macros for conveniently initializing collections from Rust's std and iterators. All of the macros support the unary .. operator which "spreads"
the values of another collection or iterator.
velcro::vec! is a drop-in replacement for std::vec!. All functionality of
the std macro is supported without overhead, but it also supports spreading values with the .. operator.
```rust use velcro::{hash_map, iter, vec};
assert_eq!(vec![0, 1, ..(2..7)], vec![0, 1, 2, 3, 4, 5, 6]);
let other = vec![3, 4, 5]; assert_eq!(vec![0, 1, 2, ..&other, 6], vec![0, 1, 2, 3, 4, 5, 6]);
let whitespace = iter![' ', '\t', '\r', '\n']; let map = hash_map! { ..('0'..='9'): "digit", ..('a'..='z'): "lower", ..('A'..='Z'): "upper", ..whitespace: "whitespace", '.': "punctuation", ',': "punctuation", };
asserteq!(map[&'x'], "lower"); asserteq!(map[&'\r'], "whitespace"); assert_eq!(map[&'.'], "punctuation"); ```
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