Comment 2 for bug 6700

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Jules Bean (jules) wrote : Re: "bzr diff -r 10..20 http://foo" unsupported

It's not just http, either. The same problem affects you if you have a non-working tree repository accessed by any method. Since 'bzr push' creates non-working-tree repositories this is quite annoying.

Diff between two versions clearly shouldn't need a working tree to operate.