New issue, when registering type multiple times.

Ideally, the module should fail when loading IMO.

example/issues.cpp

@@ -131,4 +131,25 @@ void init_issues(py::module &m) {
 	    .def("f", &A::f);
 
 	 m2.def("call_f", call_f);
+
+    {
+        struct DuplicateFoo {
+            int id() const { return 1; }
+        };
+
+        struct SingularBar : public DuplicateFoo {
+        };
+
+        pybind11::class_<DuplicateFoo>(m2, "DuplicateFoo")
+            .def_property_readonly("id", &DuplicateFoo::id)
+        ;
+
+        pybind11::class_<SingularBar>(m2, "SingularBar")
+            .def(pybind11::init<>())
+        ;
+
+        // Second time registration
+        pybind11::class_<DuplicateFoo>(m2, "DuplicateFoo")
+        ;
+    }
 }

example/issues.py

@@ -10,6 +10,7 @@ from example.issues import iterator_passthrough
 from example.issues import ElementList, ElementA, print_element
 from example.issues import expect_float, expect_int
 from example.issues import A, call_f
+from example.issues import SingularBar
 import gc
 
 print_cchar("const char *")
@@ -72,3 +73,9 @@ print("Python version")
 b = B()
 call_f(b)
 
+singularBar = SingularBar()
+try:
+    singularBar.id
+except Exception as e:
+    print("Failed as expected: " + str(e))
+

example/issues.ref

@@ -18,3 +18,4 @@ Python version
 PyA.PyA()
 PyA.f()
 In python f()
+Failed as expected: 'issues.SingularBar' object has no attribute 'id'