Fix for changes in C++

Author: james-d-mitchell

src/forest.cpp

@@ -218,7 +218,9 @@ then node ``i`` is a root node.
 )pbdoc");
     thing.def(
         "path_to_root",
-        [](Forest const& self, node_type i) { return self.path_to_root(i); },
+        [](Forest const& self, node_type i) {
+          return forest::path_to_root(self, i);
+        },
         py::arg("i"),
         R"pbdoc(
 Returns a list containing the labels of the edges on the path from a root node

tests/test_presentation_examples.py

@@ -50,12 +50,12 @@ def check_full_transformation_monoid(ns, ftm_implementation):
 
 def check_symmetric_inverse_monoid(sim_implementation):
     ReportGuard(False)
-    n = 6
+    n = 5
     p = sim_implementation(n)
     p.validate()
 
     tc = ToddCoxeter(congruence_kind.twosided, p)
-    assert tc.number_of_classes() == 13327
+    assert tc.number_of_classes() == 1546
 
 
 def test_semigroup_status():