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use crate::StringExt;
pub trait IteratorExt {
fn join(&mut self, sep: &str) -> String;
}
impl<T: Iterator<Item=impl AsRef<str>>> IteratorExt for T {
fn join(&mut self, sep: &str) -> String {
let mut out = String::new();
out.extend_join(self, sep);
out
}
}