On Tue, Aug 4, 2020 at 7:00 AM David Sumbler <da...@aeolia.co.uk> wrote:
> My latest Lilypond project had been compiling satisfactorily. But at a > certain point it began throwing out the following message: > > %%%%% > Preprocessing graphical > objects.../usr/local/lilypond/usr/share/lilypond/current/ly/engraver- > init.ly:836:5: In procedure ly:stencil-extent in expression > (ly:stencil-extent (ly:note-head::print g) X): > This particular line is trying to find the X-extent (horizontal extent) of the note-head you are printing. X and Y are defined as Scheme constants for the X (horizontal) and Y (vertical) directions. One feature of Scheme is that you can redefine anything. So you redefined X and it caused problems. A general rule for lilypond is to avoid any variable names that are all uppercase. In addition to X and Y, LEFT, CENTER, RIGHT, UP, and DOWN are all defined Scheme constants, and if you redefine them it will cause problems. HTH, Carl > >
