Add test for mixing STL casters and local binders across modules
One module uses a generic vector caster from `<pybind11/stl.h>` while
the other exports `std::vector<int>` with a local `py:bind_vector`.
diff --git a/tests/local_bindings.h b/tests/local_bindings.h
index 4c031fb..06a56fc 100644
--- a/tests/local_bindings.h
+++ b/tests/local_bindings.h
@@ -21,6 +21,14 @@
/// Mixed: global first, then local (which fails)
using MixedGlobalLocal = LocalBase<5>;
+using LocalVec = std::vector<LocalType>;
+using LocalVec2 = std::vector<NonLocal2>;
+using LocalMap = std::unordered_map<std::string, LocalType>;
+using NonLocalVec = std::vector<NonLocalType>;
+using NonLocalVec2 = std::vector<NonLocal2>;
+using NonLocalMap = std::unordered_map<std::string, NonLocalType>;
+using NonLocalMap2 = std::unordered_map<std::string, uint8_t>;
+
// Simple bindings (used with the above):
template <typename T, int Adjust, typename... Args>
py::class_<T> bind_local(Args && ...args) {