Get rid of unraisable warnings in the refnanny.

Cython/Runtime/refnanny.pyx

@@ -91,13 +91,17 @@ cdef void GOTREF(PyObject* ctx, PyObject* p_obj, int lineno):
     if ctx == NULL: return
     cdef PyObject* type = NULL, *value = NULL, *tb = NULL
     PyErr_Fetch(&type, &value, &tb)
+    try:
         try:
             if p_obj is NULL:
                 (<object>ctx).regref(None, lineno, True)
             else:
                 (<object>ctx).regref(<object>p_obj, lineno, False)
-    except Exception, e:
+        except object, e:
             report_unraisable(e)
+    except:
+        # __Pyx_GetException may itself raise errors
+        pass
     PyErr_Restore(type, value, tb)
 
 cdef int GIVEREF_and_report(PyObject* ctx, PyObject* p_obj, int lineno):
@@ -105,13 +109,17 @@ cdef int GIVEREF_and_report(PyObject* ctx, PyObject* p_obj, int lineno):
     cdef PyObject* type = NULL, *value = NULL, *tb = NULL
     cdef bint decref_ok = False
     PyErr_Fetch(&type, &value, &tb)
+    try:
         try:
             if p_obj is NULL:
                 decref_ok = (<object>ctx).delref(None, lineno, True)
             else:
                 decref_ok = (<object>ctx).delref(<object>p_obj, lineno, False)
-    except Exception, e:
+        except object, e:
             report_unraisable(e)
+    except:
+        # __Pyx_GetException may itself raise errors
+        pass
     PyErr_Restore(type, value, tb)
     return decref_ok
 
@@ -131,6 +139,7 @@ cdef void FinishContext(PyObject** ctx):
     cdef PyObject* type = NULL, *value = NULL, *tb = NULL
     cdef object errors = None
     PyErr_Fetch(&type, &value, &tb)
+    try:
         try:
             errors = (<object>ctx[0]).end()
             pos = (<object>ctx[0]).filename, (<object>ctx[0]).name
@@ -139,6 +148,9 @@ cdef void FinishContext(PyObject** ctx):
                 print errors
         except Exception, e:
             report_unraisable(e)
+    except:
+        # __Pyx_GetException may itself raise errors
+        pass
     Py_DECREF(<object>ctx[0])
     ctx[0] = NULL
     PyErr_Restore(type, value, tb)