About "Too many clashing notecolumns" warning

[Alexandre Beneteau]

Hello,

I'm currently trying lily 1.9.8 and I'm impressed by the progress which have 
done in a few weeks :-)

I'm wondering if it could be possible to make lily report possibly involved 
lines of user's code when she complains about "too many clashing notecolumns" ?
Such problem is usually easy to see on the generated score, but in some cases, 
it is not obvious at all. A solution may be to comment some code and track the 
error, but such a report from lily would imporve dramatically that sort of very 
common problem.

My question certainly shows my ignorance of lily's internals and in 
programmation too, but it's a real question and hope to not bother you by asking...

Anyway, thanks for that wonderful software :-)

Alex.