Hi, with a forced update around Feb. 10th. The tag 2.10.0 moved from commit:

commit 83f1e2f
Author: Murray Cumming murrayc@murrayc.com
Date: Tue Sep 20 12:13:23 2016 +0200

2.10.0

to

commit 9e5e38c
Author: Murray Cumming murrayc@murrayc.com
Date: Wed Mar 16 12:35:55 2016 +0100

test_retype: Add test of R(Args...) syntax.

I see, that the original commit is no longer present on master but still lives on branch libsigc++-2-10.
Could you maybe update the 2.10.0 tag accordingly?