{"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
    fn assume_integer_range(&mut self, imm: Self::Value, ty: Self::Type, range: WrappingRange) {
    /// optimization level and `Scalar::is_always_valid` before calling it.
        let WrappingRange { start, end } = range;