Ignoring note clash

[Knute Snortum]

This post is mostly for me to discover whether there's a better way to do what I'm doing.

The following code produces the output I want, but it suppresses a warning:

%%%%%%%%%%%%%%%%%%%%%%

\version "2.18.2"

\language "english"

ignoreClash = \override NoteColumn.ignore-collision = ##t

\relative c {

  \clef bass

  \time 2/2

  

  <<

    { \ignoreClash <g g'>2 ( <d d'>4 <c c'> ) }

    \\ 

    { \acciaccatura { \stemUp <ef, ef'>8 } <ef ef'>1  }

  >> 

}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

If I remove \ignoreClash, I get a warning that there are too many clashing note columns.  The output is still fine.

My questions are these: 1) is there a better way to do this other than suppressing a warning, and 2) since it doesn't look like there are clashing note columns, what is the warning telling me exactly?

Knute Snortum

(via Gmail)