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pub fn fmt_vec_split_with<T: fmt::Display>(v: &[T], splitter: &str) -> String {
fmt_iter_split_with(v.iter(), splitter)
}
pub fn fmt_set_split_with<T: fmt::Display + std::hash::Hash>(s: &Set<T>, splitter: &str) -> String {
fmt_iter_split_with(s.iter(), splitter)
}