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fix #6687
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@ -757,6 +757,7 @@ public:
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expr* x, *y;
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if (uncnstr(args[0]) && num == 2 &&
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args[1]->get_ref_count() == 1 &&
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seq.str.is_concat(args[1], x, y) &&
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uncnstr(x)) {
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mk_fresh_uncnstr_var_for(f, r);
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