For example, consider the following Go definition:
</p>

<pre>
type reader struct {
	buf [bufSize]byte
	r   int
}
</pre>

<p>
Assembly can refer to the size of this struct
as <code>reader__size</code> and the offsets of the two fields
as <code>reader_buf</code> and <code>reader_r</code>.
Hence, if register <code>R1</code> contains a pointer to
a <code>reader</code>, assembly can reference the <code>r</code> field

            int totalBytes = copy.encode(buffer, 0);

            // Then
            assertEquals(HEADER_SIZE + 20 + 24 + 22, totalBytes);
            verify(mockChunk1).encode(buffer, HEADER_SIZE);
            verify(mockChunk2).encode(buffer, HEADER_SIZE + 20);
            verify(mockChunk3).encode(buffer, HEADER_SIZE + 20 + 24);
        }
    }