Don't call classdef-overloaded subsref from builtin calls. * ov-class.cc (called_from_builtin): Moved to ov-base.cc. * ov-base.cc (called_from_builtin): Moved from ov-class.cc. * ov-base.h (called_from_builtin): Declare in octave API. * ov-classdef.cc (octave_classdef::subsref): Don't call overloaded subsref when called from "builtin".

--- a/libinterp/octave-value/ov-classdef.cc
+++ b/libinterp/octave-value/ov-classdef.cc
@@ -895,7 +895,7 @@
 
   cdef_class cls = object.get_class ();
 
-  if (! in_class_method (cls))
+  if (! in_class_method (cls) && ! called_from_builtin ())
     {
       cdef_method meth = cls.find_method ("subsref");