Feature #4254 ยป 0001-method-transplanting-Allow-to-set-an-UnboundMethod-t.patch
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if (rb_obj_is_method(body)) {
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struct METHOD *method = (struct METHOD *)DATA_PTR(body);
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VALUE rclass = method->rclass;
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if (rclass != mod && !RTEST(rb_class_inherited_p(mod, rclass))) {
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if (FL_TEST(rclass, FL_SINGLETON)) {
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rb_raise(rb_eTypeError,
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"can't bind singleton method to a different class");
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}
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else {
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rb_raise(rb_eTypeError,
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"bind argument must be a subclass of %s",
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rb_class2name(rclass));
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}
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}
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rb_method_entry_set(mod, id, &method->me, noex);
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}
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else if (rb_obj_is_proc(body)) {
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