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fix crash in BV internalizer due to unknown bv_neg symbol
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@ -773,7 +773,7 @@ br_status fpa_rewriter::mk_to_ieee_bv(func_decl * f, expr * arg, expr_ref & resu
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if (m_fm.is_nan(v)) {
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if (m_hi_fp_unspecified) {
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expr * args[4] = { bu.mk_numeral(0, 1),
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bu.mk_bv_neg(bu.mk_numeral(1, x.get_ebits())),
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bu.mk_numeral(rational::minus_one(), x.get_ebits()),
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bu.mk_numeral(0, x.get_sbits() - 2),
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bu.mk_numeral(1, 1) };
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result = bu.mk_concat(4, args);
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