write a message when somebody tries to \set a grob property (instead of \override)

[Eluze]

as a follow up to
http://lilypond.1069038.n5.nabble.com/crash-when-setting-a-grob-if-it-is-used-afterwards-td137583.html
I'd like to ask for an enhancement:

write a message to the log when \set is used with a grob property (this can
cause an abnormal termination of LilyPond without any hint why it happened)


example:

{ \set Fingering = #'(up) g -1 }        % causes LilyPond to crash.


the message should inform that combining Fingering with \set is quite
unusual:

Note: [line/position] usually \override is used to change grob attributes -
trying to continue with the new settings.


I don't know if this should range as an error, a warning or just a note.

thanks!

Eluze





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