+ ++result;
+ clog << "solution of the system " << eqns << " for " << vars
+ << " erroneously returned " << sol << endl;
+ }
+
+ return result;
+}
+
+static unsigned exam_lsolve2S(void)
+{
+ // A degenerate example that went wrong in GiNaC 0.6.2.
+ unsigned result = 0;
+ symbol x("x"), y("y"), t("t");
+ lst eqns, vars;
+ ex sol;
+
+ // Create the linear system [0*x+0*y==0,0*x+1*y==t]...
+ eqns.append(0*x+0*y==0).append(0*x+1*y==t);
+ // ...to be solved for [x,y]...
+ vars.append(x).append(y);
+ // ...and solve it:
+ sol = lsolve(eqns, vars);
+ ex sol_x = sol.op(0).rhs(); // rhs of solution for first variable (x)
+ ex sol_y = sol.op(1).rhs(); // rhs of solution for second variable (y)
+
+ // It should have returned [x==x,y==t]
+ if (!(sol_x - x).is_zero() ||
+ !(sol_y - t).is_zero()) {
+ ++result;