#include "international.hh"
#include "item.hh"
#include "main.hh"
-#include "simple-closure.hh"
#include "smobs.hh"
#include "spanner.hh"
#include "unpure-pure-container.hh"
return typecheck_grob (symbol, upc->unpure_part ())
&& typecheck_grob (symbol, upc->pure_part ());
return ly_is_procedure (value)
- || unsmob<Simple_closure> (value)
|| type_check_assignment (symbol, value, ly_symbol2scm ("backend-type?"));
}