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Using path expressions to override stencils

From: Paul Booker
Subject: Using path expressions to override stencils
Date: Tue, 16 Feb 2016 13:35:47 +0000 (UTC)
User-agent: Loom/3.14 (http://gmane.org/) 
Regarding LSR item 623:
    http://lsr.di.unimi.it/LSR/Search?q=623

I'm sure I had this working with v2.18.2 but not having any luck with v2.19.36

In Win 8.1 I get an error message:

..../lily/grob-property.cc, Line 243

Expression: scm_is_null(value) || scm_is_eq(value, marker)

I've only narrowed the problem down to the function

scaleCustomClefStencilTwo =
#(lambda (grob)
    (let* ((sz (ly:grob-property grob 'font-size 0.0))
           (mult (magstep sz)))
        (set! (ly:grob-property grob 'stencil) 
          (ly:stencil-scale
            customClefStencilTwo
            mult mult))))
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