[experimental.topic.linear-merge does no work?] (was: evolve 10.1.0 returns error)

[Uwe Brauer]

   > BTW, *how*  do  I use the experimental.topic.linear-merge  feature?


It seems not to work.
As I said I use hg 5.2, 
and evolve based on changeset 3f9ef377e670

which is installed as 10.10

Then I have 
[experimental]
experimental.topic.linear-merge = True


And run 
hg init
echo "First" > test.org
hg add test.org
hg commit -u "Bernhard Riemann <bernhard.riemann at gmail.com>" -m "First"
echo "Second" >> test.org
hg commit -u "Bernhard Riemann <bernhard.riemann at gmail.com>" -m "Second"
echo "Third" >> test.org
hg commit -u "Bernhard Riemann <bernhard.riemann at gmail.com>" -m "Third"
echo "Forth" >> test.org
hg commit  -m "Fourth"
hg topics NewTopic
echo "Fifth" >> test.org
hg commit  -m "Fifth"
echo "Six" >> test.org
hg commit  -m "Six"
hg up 3 
hg merge NewTopic


But I receive 
abort: nothing to merge


What do I miss

regards