+ symbol x("x"), y("y");
+ ex e, f;
+ e = pow(x+y,200).expand();
+ f = e.subs(x == -y);
+ if (f != 0)
+ ++result;
+}
+/*
+ * Denny Fliegner's test using vector<symbol> tests Cint's memory management.
+ */
+#include <sstream>
+{
+ vector<symbol> a;
+ ex bigsum = 0;
+ for (int i=0; i<42; ++i) {
+ ostringstream buf;
+ buf << "a" << i << ends;
+ a.push_back(symbol(buf.str()));
+ bigsum += a[i];
+ }
+ ex sbtrct = -bigsum + a[0] + a[1];
+ if (pow(bigsum,2).expand().subs(a[0]==sbtrct).expand() != pow(a[1],2))
+ ++result;