Iterator

    pub const Iterator = struct {
        reader: Io.Reader,

        pub const empty: Iterator = .{ .reader = .ending_instance };

        pub fn next(self: *Iterator) error{InvalidDebugInfo}!?BinaryAnnotation {
            return take(&self.reader) catch |err| switch (err) {
                error.ReadFailed => return error.InvalidDebugInfo,
                error.EndOfStream => return null,
            };
        }
    }