Better error message if ucnhash cannot be found (obscure attribute

errors aren't that helpful), or doesn't contain what's expected from
it.  Also tweaked the test script so it compiles even if ucnhash is
missing.

1 files changed, 8 insertions, 3 deletions

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index a06c40b9d6..585afe6364 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1240,15 +1240,15 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
                 PyObject *mod = 0, *v = 0;
                 mod = PyImport_ImportModule("ucnhash");
                 if (mod == NULL)
-                    goto onError;
+                    goto ucnhashError;
                 v = PyObject_GetAttrString(mod,"Unicode_Names_CAPI");
                 Py_DECREF(mod);
                 if (v == NULL)
-                    goto onError;
+                    goto ucnhashError;
                 unicode_names = PyCObject_AsVoidPtr(v);
                 Py_DECREF(v);
                 if (unicode_names == NULL)
-                    goto onError;
+                    goto ucnhashError;
             }
                 
             if (*s == '{') {
@@ -1311,6 +1311,11 @@ store:
 		goto onError;
     return (PyObject *)v;
     
+ ucnhashError:
+    PyErr_SetString(PyExc_UnicodeError,
+                    "\\N escapes not supported (can't load ucnhash module)");
+    return NULL;
+
  onError:
     Py_XDECREF(v);
     return NULL;