-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Deferred method called", "src/modelbuilder.nit", 510);
+const char* var_class_name;
+var_class_name = self == NULL ? "null" : self->type->name;
+fprintf(stderr, "Runtime error: Abstract method `%s` called on `%s`", "mvisibility", var_class_name);
+fprintf(stderr, " (%s:%d)\n", "src/modelbuilder.nit", 510);