warning message for wrong context

[Werner LEMBERG]

Let's assume we have the following

  {
    ...
    \override BarLine #'stencil = ##f
    ...
  }

This does nothing because it's the wrong context; we have to write

  \override Staff.BarLine #'stencil = ##f

My question: Is it possible to implement a warning message for the
former case, printing something like

  overriding property `stencil' for grob `BarLine' has no effect in
  context `Voice'

?  I can imagine that this would help many users, including me.


    Werner