synced to 1.2

diff --git a/check/exam_misc.cpp b/check/exam_misc.cpp
index 25183af37a472c8f0dc6e1b5f1997633abbaf837..c10d869cfa5484630fba66c8a7ae8510c02c6a36 100644 (file)
--- a/check/exam_misc.cpp
+++ b/check/exam_misc.cpp
@@ -243,6 +243,27 @@ static unsigned exam_joris(void)
        return result;
 }
 
+/* Test Chris Dams' algebraic substitutions. */
+static unsigned exam_subs_algebraic()
+{
+       unsigned result = 0;
+       symbol x("x"), y("y");
+
+       ex e = ex(x*x*x*y*y).subs(x*y==2, subs_options::subs_algebraic);
+       if (e != 4*x) {
+               clog << "(x^3*y^2).subs(x*y==2,subs_options::subs_algebraic) erroneously returned " << e << endl;
+               ++result;
+       }
+
+       e = ex(x*x*x*x*x).subs(x*x==y, subs_options::subs_algebraic);
+       if (e != y*y*x) {
+               clog << "x^5.subs(x^2==y,subs_options::subs_algebraic) erroneously returned " << e << endl;
+               ++result;
+       }
+       
+       return result;
+}
+
 unsigned exam_misc(void)
 {
        unsigned result = 0;
@@ -257,6 +278,7 @@ unsigned exam_misc(void)
        result += exam_operator_semantics(); cout << '.' << flush;
        result += exam_subs(); cout << '.' << flush;
        result += exam_joris(); cout << '.' << flush;
+       result += exam_subs_algebraic(); cout << '.' << flush;
        
        if (!result) {
                cout << " passed " << endl;