Phabricator question

[Iavor Diatchki]

Hello,

I followed the instruction on the GHC wiki, and published an `arc` revision
for my work on the typeable-with-kinds branch. The result was called D652.

After I did this, I noticed a bug, and some redundant code;  so I fixed my
branch.  How can I update D652, so that it will diff using the most current
version of my branch?

-Iavor
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