diff -up src/sage/modular/arithgroup/farey.cpp.orig src/sage/modular/arithgroup/farey.cpp --- src/sage/modular/arithgroup/farey.cpp.orig 2014-05-26 13:28:28.975770939 -0300 +++ src/sage/modular/arithgroup/farey.cpp 2014-05-26 13:28:45.777771582 -0300 @@ -141,6 +141,7 @@ operator*(const SL2Z& M, const vector