+(define-public (backend-testing output-module)
+ (define (missing-stencil-expression name)
+ (begin
+ (ly:warning (_ "missing stencil expression `~S'") name)
+ ""))
+
+ (map (lambda (x)
+ (if (not (module-defined? output-module x))
+ (module-define! output-module x
+ (lambda* (#:optional y . z)
+ (missing-stencil-expression x)))))
+ (ly:all-stencil-commands)))