--- a/CHANGELOG	Thu Mar 07 01:57:43 2019 +0530
+++ b/CHANGELOG	Mon Mar 25 15:44:44 2019 -0700
@@ -6,6 +6,7 @@
 
   * split: preserve phases (issue6048)
   * evolve: fix an recoverable state (issue6053)
+  * prune: fix error message when pruning public changesets
 
 8.4.0 -- 2019-12-22
 -------------------

--- a/hgext3rd/evolve/cmdrewrite.py	Thu Mar 07 01:57:43 2019 +0530
+++ b/hgext3rd/evolve/cmdrewrite.py	Mon Mar 25 15:44:44 2019 -0700
@@ -1013,7 +1013,7 @@
     try:
         wlock = repo.wlock()
         lock = repo.lock()
-        rewriteutil.precheck(repo, revs, 'touch')
+        rewriteutil.precheck(repo, revs, 'prune')
         tr = repo.transaction('prune')
         # defines pruned changesets
         precs = []

--- a/tests/test-evolve.t	Thu Mar 07 01:57:43 2019 +0530
+++ b/tests/test-evolve.t	Mon Mar 25 15:44:44 2019 -0700
@@ -145,7 +145,7 @@
   $ hg log -r 1 --template '{rev} {phase} {obsolete}\n'
   1 public 
   $ hg prune 1
-  abort: cannot touch public changesets: 7c3bad9141dc
+  abort: cannot prune public changesets: 7c3bad9141dc
   (see 'hg help phases' for details)
   [255]
   $ hg log -r 1 --template '{rev} {phase} {obsolete}\n'
@@ -1310,11 +1310,11 @@
   $ mkcommit c5_
   created new head
   $ hg prune '0ef9ff75f8e2 + f1b85956c48c'
-  abort: touch will orphan 1 descendants
+  abort: prune will orphan 1 descendants
   (see 'hg help evolution.instability')
   [255]
   $ hg prune '98e171e2f272::0d9203b74542'
-  abort: touch will orphan 1 descendants
+  abort: prune will orphan 1 descendants
   (see 'hg help evolution.instability')
   [255]
   $ hg prune '0ef9ff75f8e2::'

--- a/tests/test-prune.t	Thu Mar 07 01:57:43 2019 +0530
+++ b/tests/test-prune.t	Mon Mar 25 15:44:44 2019 -0700
@@ -92,7 +92,7 @@
 cannot prune public changesets
 
   $ hg prune 0
-  abort: cannot touch public changesets: 1f0dee641bb7
+  abort: cannot prune public changesets: 1f0dee641bb7
   (see 'hg help phases' for details)
   [255]
   $ hg debugobsolete