confused about rebase

[Neal Becker]

I have boost_1_44_0.dist which is the upstream hg repo
I have boost_1_44_0.hg which is the upstream, with my patches added.

I updated to boost_1_45_0.dist by:
<extract tar file to new dir boost_1_45_0.dist>
cp -al boost_1_44_0.dist/.hg* boost_1_45_0.dist
cd boost_1_45_0.dist
hg addremove
hg ci

everything looks good - I have a boost_1_45_0.dist matching upstream

Now 
cp -al boost_1_45_0.dist boost_1_45_0.hg
cd boost_1_45_0.hg
hg pull --rebase ../boost_1_44_0.hg  <<< pull in my patches

pulling from ../boost_1_44_0.hg
searching for changes
adding changesets
adding manifests
adding file changes
added 18 changesets with 93 changes to 93 files (+1 heads)
nothing to rebase

Nothing to rebase?