switched internal usage of cast_error exception to reference_cast_error

include/pybind11/cast.h

@@ -254,7 +254,7 @@ public:
     template <typename T> using cast_op_type = pybind11::detail::cast_op_type<T>;
 
     operator type*() { return (type *) value; }
-    operator type&() { if (!value) throw cast_error(); return *((type *) value); }
+    operator type&() { if (!value) throw reference_cast_error(); return *((type *) value); }
 
 protected:
     typedef void *(*Constructor)(const void *stream);

include/pybind11/common.h

@@ -310,6 +310,7 @@ PYBIND11_RUNTIME_EXCEPTION(stop_iteration)
 PYBIND11_RUNTIME_EXCEPTION(index_error)
 PYBIND11_RUNTIME_EXCEPTION(value_error)
 PYBIND11_RUNTIME_EXCEPTION(cast_error) /// Thrown when pybind11::cast or handle::call fail due to a type casting error
+PYBIND11_RUNTIME_EXCEPTION(reference_cast_error) /// Used internally
 
 [[noreturn]] PYBIND11_NOINLINE inline void pybind11_fail(const char *reason) { throw std::runtime_error(reason); }
 [[noreturn]] PYBIND11_NOINLINE inline void pybind11_fail(const std::string &reason) { throw std::runtime_error(reason); }

include/pybind11/pybind11.h

@@ -387,7 +387,7 @@ protected:
                     if ((kwargs_consumed == nkwargs || it->has_kwargs) &&
                         (nargs_ == it->nargs || it->has_args))
                         result = it->impl(it, args_, kwargs, parent);
-                } catch (cast_error &) {
+                } catch (reference_cast_error &) {
                     result = PYBIND11_TRY_NEXT_OVERLOAD;
                 }