hg diff and moves

[Dave S]

I was using hg 1.9-something (what Fedora is still pointing at, it
seems) and found myself diffing file X/Y/Z/foo.c with /dev/null
because I had done

hg move W/foo.c X/Y/Z

and hg diff  -r new -r old wasn't following, and the command doesn't
seem to have a follow option.    Am I missing understanding how to do
the the diff, or did perhaps following get added to the more recent
releases?

/dps


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