X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Fexam_misc.cpp;h=fc9c41ebc48e61d302f544fce1fb04bf662f7220;hp=2d0f29e152c21f80a6e8a52480dbec6acf61b1ed;hb=4bce949dac6328bc9fcfcd3f875fd422055745f4;hpb=67467d256b44f5e08498ca81c946d9ffaa25d1e2

diff --git a/check/exam_misc.cpp b/check/exam_misc.cpp
index 2d0f29e1..fc9c41eb 100644
--- a/check/exam_misc.cpp
+++ b/check/exam_misc.cpp
@@ -3,7 +3,7 @@
  */
 
 /*
- *  GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -20,11 +20,12 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#include <iostream>
 #include "ginac.h"
-using namespace std;
 using namespace GiNaC;
 
+#include <iostream>
+using namespace std;
+
 #define VECSIZE 30
 static unsigned exam_expand_subs()
 {
@@ -218,6 +219,15 @@ static unsigned exam_subs()
 		++result;
 	}
 
+	// And this used to fail in GiNaC 1.5.8 because it first substituted
+	// exp(x) -> exp(log(x)) -> x, and then substitued again x -> log(x)
+	e1 = exp(x);
+	e2 = e1.subs(x == log(x));
+	if (!e2.is_equal(x)) {
+		clog << "exp(x).subs(x==log(x)) erroneously returned " << e2 << " instead of x" << endl;
+		++result;
+	}
+
 	e1 = sin(1+sin(x));
 	e2 = e1.subs(sin(wild()) == cos(wild()));
 	if (!e2.is_equal(cos(1+cos(x)))) {