They moved it to 1.7 because it didn&#x27;t get completed in time. You can see the source code here:  <a href="https:&#x2F;&#x2F;github.com&#x2F;golang&#x2F;go&#x2F;tree&#x2F;dev.ssa" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;golang&#x2F;go&#x2F;tree&#x2F;dev.ssa</a> (In particular, <a href="https:&#x2F;&#x2F;github.com&#x2F;golang&#x2F;go&#x2F;compare&#x2F;dev.ssa" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;golang&#x2F;go&#x2F;compare&#x2F;dev.ssa</a> is interesting).<p>It&#x27;s not clear to me what work is left, but hopefully it gets merged super early in the 1.7 cycle.