Method insert

cranelift/bforest/src/set.rs:107–114

Try to insert `key` into the set. If the set did not contain `key`, insert it and return true. If `key` is already present, don't change the set and return false.

(
        &mut self,
        key: K,
        forest: &mut SetForest<K>,
        comp: &C,
    )

    ///
    /// If `key` is already present, don't change the set and return false.
    pub fn insert<C: Comparator<K>>(
        &mut self,
        key: K,
        forest: &mut SetForest<K>,
        comp: &C,
    ) -> bool {
        self.cursor(forest, comp).insert(key)
    }

    /// Like `insert` but returns an error on allocation failure.
    pub fn try_insert<C: Comparator<K>>(