Mono: "mdoc: There is an error in XML document" - mono

Question

I modified a few lines of C# code in the source of Mono, and now it does not build anymore:
make[7]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs/mcs'
make[7]: Entering directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs/docs'
/usr/bin/make all-local
make[8]: Entering directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs/docs'
MDOC [net_4_0] cs-errors.tree
mdoc: There is an error in XML document.
See `mdoc help' for more information.
make[8]: *** [cs-errors.tree] Error 1
make[8]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs/docs'
make[7]: *** [do-all] Error 2
make[7]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs/docs'
make[6]: *** [all-recursive] Error 1
make[6]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs'
make[5]: *** [profile-do--net_4_0--all] Error 2
make[5]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs'
make[4]: *** [profiles-do--all] Error 2
make[4]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/mcs'
make[3]: *** [all-local] Error 2
make[3]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1/runtime'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/nico/src/mono-roman/mono-2.10.8.1'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
Build command 'cd mono-2.10.8.1 && dpkg-buildpackage -b -uc' failed.
E: Child process failed
The problem is mdoc: There is an error in XML document. MDOC is a kind of Javadoc for Mono. I am surprised that changing a few benign C# lines would make MDOC fail?
Any tip on what is going on here? I also have no idea what XML document this is about.

Answer 1

The initial analysis I posted in the comments seems to be right. MDOC is loading the cs-errors.config, and using the newly built runtime. The changes you have made produce the following exception while loading said file:
System.InvalidOperationException: Element 'FilesPath' has wrong order in sequence (expected - -1, actual - 0
This was added by your patch. I am guessing you might want to check readBySoapOrder as well, such as:
if (readBySoapOrder && info.ExplicitOrder != ind)
throw new InvalidOperationException(string.Format("Element '{0}' has wrong order in sequence (expected - {1}, actual - {2}", Reader.LocalName, info.ExplicitOrder, ind));
With this little change MDOC is happy and compilation succeeds, but I have no idea if it is the correct behavior.

Answer 2

Try "make clean" before trying "make" again.