Range

        pub const Range = struct {
            line_offset: i32,
            file_id: ?u32,
            code_offset: u32,
            code_length: u32,

            pub fn contains(self: Range, offset_in_func: usize) bool {
                return self.code_offset <= offset_in_func and
                    offset_in_func < self.code_offset + self.code_length;
            }
        }