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pub trait _StrExt {
fn _is_char_boundary(&self, index: usize) -> bool;
}
impl _StrExt for str {
#[inline]
fn _is_char_boundary(&self, index: usize) -> bool {
if index == self.len() {
return true;
}
match self.as_bytes().get(index) {
None => false,
Some(&b) => !(128..192).contains(&b),
}
}
}