Backport #1962 ยป Array.patch
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if (NIL_P(tmp)) {
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/* hack to avoid invoke Object#to_a */
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VALUE origin;
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const NODE *body;
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ID id = rb_intern("to_a");
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if (search_method(CLASS_OF(val), id, &origin) &&
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if ((body = search_method(CLASS_OF(val), id, &origin)) &&
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body->nd_body && /* not an undef'd method */
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RCLASS(origin)->m_tbl != RCLASS(rb_mKernel)->m_tbl) { /* exclude Kernel#to_a */
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val = rb_funcall(val, id, 0);
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if (TYPE(val) != T_ARRAY) {
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