Method insert

src/prof/src/lib.rs:243–251

(&mut self, s: &str)

    }

    fn insert(&mut self, s: &str) -> i64 {
        if let Some(idx) = self.0.get(s) {
            *idx
        } else {
            let idx = i64::try_from(self.0.len()).expect("must fit");
            self.0.insert(s.into(), idx);
            idx
        }
    }

    fn finish(self) -> Vec<String> {
        let mut vec: Vec<_> = self.0.into_iter().collect();