diff --git a/tests/test-rebase-conflicts.t b/tests/test-rebase-conflicts.t
--- a/tests/test-rebase-conflicts.t
+++ b/tests/test-rebase-conflicts.t
@@ -429,3 +429,66 @@
   |/
   o  0:draft 'A'
   
+Test to make sure that pruning while rebasing doesn't confuse rebase (issue6180)
+  $ cat >> $HGRCPATH <<EOF
+  > [experimental]
+  > evolution.createmarkers=True
+  > evolution.allowunstable=True
+  > [rebase]
+  > experimental.inmemory=1
+  > EOF
+
+The test case below starts a rebase of 2 commits and runs into conflicts on
+the first one. We then decide we don't want the changes from that commit, so
+we revert the changes and also prune the original commit.
+Now what we expect from `hg rebase --continue` is that it skip rebasing first
+one (since it's pruned) but don't skip second one.
+
+  $ hg init issue6180
+  $ cd issue6180
+  $ echo 0 > a
+  $ hg ci -Aqm 'add a'
+  $ echo 1 > a
+  $ hg ci -m 'edit a'
+  $ hg co -q 0
+  $ echo 2 > a
+  $ hg ci -qm 'conflict in a'
+  $ echo 3 > b
+  $ hg ci -Aqm 'add b'
+  $ hg tglog
+  @  3:draft 'add b'
+  |
+  o  2:draft 'conflict in a'
+  |
+  | o  1:draft 'edit a'
+  |/
+  o  0:draft 'add a'
+  
+  $ hg rebase -d 1
+  rebasing 2:06a50ac6b5ab "conflict in a"
+  merging a
+  hit merge conflicts; re-running rebase without in-memory merge
+  rebasing 2:06a50ac6b5ab "conflict in a"
+  merging a
+  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
+  unresolved conflicts (see hg resolve, then hg rebase --continue)
+  [1]
+  $ echo 1 > a
+  $ hg debugobsolete $(hg id -ir 2 --debug)
+  1 new obsolescence markers
+  obsoleted 1 changesets
+  1 new orphan changesets
+  $ hg resolve -m
+  (no more unresolved files)
+  continue: hg rebase --continue
+XXX: it should have rebased revision 3 since it made changes unrelated to
+destination, so no reason to say "its destination already has all its changes"
+  $ hg rebase -c
+  note: not rebasing 2:06a50ac6b5ab "conflict in a", it has no successor
+  rebasing 3:aea370672fd7 "add b" (tip)
+  note: not rebasing 3:aea370672fd7 "add b" (tip), its destination already has all its changes
+  $ hg tglog
+  @  1:draft 'edit a'
+  |
+  o  0:draft 'add a'
+