--- a/tests/test-evolve-obshistory-complex.t	Fri Dec 27 20:38:10 2019 -0800
+++ b/tests/test-evolve-obshistory-complex.t	Fri Dec 27 20:40:13 2019 -0800
@@ -469,3 +469,53 @@
   x  c473644ee0e9 (2) B
        rewritten(description, parent, content) as b868bc49b0a4 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
   
+
+  $ hg obslog --precursors --no-successors --all 15
+  o  19e14c8397fc (10) fold0
+  |    rewritten(parent, content) from b868bc49b0a4 using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  |
+  | *    7b3290f6e0a0 (12) fold1
+  | |\     rewritten(parent, content) from d15d0ffc75f6 using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | |    rewritten(description, parent, content) from e036916b63ea using prune by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | |
+  | | | @  d4a000f63ee9 (15) fold2
+  | | | |    rewritten(parent, content) from 100cc25b765f using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | |
+  | | | | *  ec31316faa9d (14) fold2
+  | | | |/|    rewritten(parent, content) from 100cc25b765f using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | |    rewritten(description, parent, content) from d0f33db50670 using prune by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | |      note: this is a note stored in obsmarker in prune
+  | | | | |
+  | | | x |    100cc25b765f (9) fold2
+  | | | |\ \     rewritten(description, content) from 0da815c333f6 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | | |      note: folding changesets to test
+  | | | | | |    rewritten(description, parent, content) from d9f908fde1a1 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | | |      note: folding changesets to test
+  | | | | | |
+  | +-------x  d0f33db50670 (13) fold1
+  | | | | |      rewritten(parent, content) from d15d0ffc75f6 using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | |
+  +---x | |  e036916b63ea (11) fold0
+  | |  / /     rewritten(parent, content) from b868bc49b0a4 using split by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | |
+  | | x /  0da815c333f6 (5) E
+  | |  /
+  x | |    b868bc49b0a4 (7) fold0
+  |\ \ \     rewritten(description, content) from 2a34000d3544 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | |    rewritten(description, parent, content) from c473644ee0e9 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | |
+  | | x |    d15d0ffc75f6 (8) fold1
+  | | |\ \     rewritten(description, parent, content) from 868d2e0eb19c using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | |    rewritten(description, content) from a8df460dbbfe using fold by test (Thu Jan 01 00:00:00 1970 +0000)
+  | | | | |
+  | | | | x  d9f908fde1a1 (6) F
+  | | | |
+  x | | |  2a34000d3544 (1) A
+   / / /
+  | x /  868d2e0eb19c (4) D
+  |  /
+  | x  a8df460dbbfe (3) C
+  |
+  x  c473644ee0e9 (2) B
+  
+