Method build_in_level

src/tree/binary/builder/level.rs:20–22

(vec: &[&str])

impl<K: std::str::FromStr, V> BuildTreeInLevel<K, V> for TreeBuilder {
    fn build_in_level(vec: &[&str]) -> Tree<K, V> {
        build(vec)
    }
}

// ?? why K: std::str::FromStr