tests/test-amend.t

47551:b7a706e7843a

      set experimental.evolution.allowdivergence=True to skip this check
  (see 'hg help evolution.instability' for details on content-divergence)
  [10]
  $ hg amend -m divergent --config experimental.evolution.allowdivergence=true
  2 new content-divergent changesets
#endif

Cannot amend public changeset

  $ hg phase -r A --public

47552:93ca7d3278b9

      set experimental.evolution.allowdivergence=True to skip this check
  (see 'hg help evolution.instability' for details on content-divergence)
  [10]
  $ hg amend -m divergent --config experimental.evolution.allowdivergence=true
  2 new content-divergent changesets

Hidden common predecessor of divergence does not cause crash

First create C1 as a pruned successor of C
  $ hg co C
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg amend -m C1
  $ hg tag --local C1
  $ hg debugobsolete $(hg log -T '{node}' -r C1)
  1 new obsolescence markers
  obsoleted 1 changesets
Now create C2 as other side of divergence (not actually divergent because C1 is
pruned)
  $ hg co C
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg amend -m C2
  1 new orphan changesets
Make the common predecessor (C) pruned
  $ hg tag --local --remove C
  $ hg co C1
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
Try to cause divergence
  $ hg amend -m C11
  abort: filtered revision '26805aba1e600a82e93661149f2313866a221a7b' (known-bad-output !)
  [255]
 [10]
#endif

Cannot amend public changeset

  $ hg phase -r A --public