Function building_blocks_search::greedy_best_first

pub fn greedy_best_first<N, C, FN, IN, FH, FS>(
    start: &N, 
    successors: FN, 
    heuristic: FH, 
    success: FS, 
    max_iterations: usize
) -> (bool, Vec<N>) where
    N: Eq + Hash + Clone,
    C: Ord + Copy,
    FN: FnMut(&N) -> IN,
    IN: IntoIterator<Item = N>,
    FH: FnMut(&N) -> C,
    FS: FnMut(&N) -> bool,