Replace "on" with "when"

Author: vstinner

Modules/_datetimemodule.c

@@ -226,7 +226,7 @@ clear_current_module(PyInterpreterState *interp, PyObject *expected)
     goto finally;
 
 error:
-    PyErr_FormatUnraisable("Exception ignored on clearing _datetime module");
+    PyErr_FormatUnraisable("Exception ignored when clearing _datetime module");
 
 finally:
     PyErr_SetRaisedException(exc);

Modules/_testcapi/watchers.c

@@ -428,7 +428,7 @@ allocate_too_many_code_watchers(PyObject *self, PyObject *args)
     PyObject *exc = PyErr_GetRaisedException();
     for (int i = 0; i < num_watchers; i++) {
         if (PyCode_ClearWatcher(watcher_ids[i]) < 0) {
-            PyErr_FormatUnraisable("Exception ignored on "
+            PyErr_FormatUnraisable("Exception ignored when "
                                    "clearing code watcher");
             break;
         }
@@ -610,7 +610,7 @@ allocate_too_many_func_watchers(PyObject *self, PyObject *args)
     PyObject *exc = PyErr_GetRaisedException();
     for (int i = 0; i < num_watchers; i++) {
         if (PyFunction_ClearWatcher(watcher_ids[i]) < 0) {
-            PyErr_FormatUnraisable("Exception ignored on "
+            PyErr_FormatUnraisable("Exception ignored when "
                                    "clearing function watcher");
             break;
         }
@@ -757,7 +757,7 @@ allocate_too_many_context_watchers(PyObject *self, PyObject *args)
     PyObject *exc = PyErr_GetRaisedException();
     for (int i = 0; i < num_watchers; i++) {
         if (PyContext_ClearWatcher(watcher_ids[i]) < 0) {
-            PyErr_FormatUnraisable("Exception ignored on "
+            PyErr_FormatUnraisable("Exception ignored when "
                                    "clearing context watcher");
             break;
         }

Modules/_winapi.c

@@ -177,7 +177,7 @@ overlapped_dealloc(OverlappedObject *self)
             PyErr_SetString(PyExc_PythonFinalizationError,
                             "I/O operations still in flight while destroying "
                             "Overlapped object, the process may crash");
-            PyErr_FormatUnraisable("Exception ignored on deallocating "
+            PyErr_FormatUnraisable("Exception ignored when deallocating "
                                    "overlapped operation %R", self);
         }
         else {

Modules/atexitmodule.c

@@ -110,7 +110,7 @@ atexit_callfuncs(struct atexit_state *state)
     PyObject *copy = PyList_GetSlice(state->callbacks, 0, PyList_GET_SIZE(state->callbacks));
     if (copy == NULL)
     {
-        PyErr_FormatUnraisable("Exception ignored on "
+        PyErr_FormatUnraisable("Exception ignored when "
                                "copying atexit callbacks");
         return;
     }

Modules/overlapped.c

@@ -759,7 +759,7 @@ Overlapped_dealloc(OverlappedObject *self)
                     PyExc_RuntimeError,
                     "%R still has pending operation at "
                     "deallocation, the process may crash", self);
-                PyErr_FormatUnraisable("Exception ignored on deallocating "
+                PyErr_FormatUnraisable("Exception ignored when deallocating "
                                        "overlapped operation %R", self);
         }
     }

Modules/signalmodule.c

@@ -1837,7 +1837,7 @@ _PyErr_CheckSignalsTstate(PyThreadState *tstate)
             PyErr_Format(PyExc_OSError,
                          "Signal %i ignored due to race condition",
                          i);
-            PyErr_FormatUnraisable("Exception ignored on "
+            PyErr_FormatUnraisable("Exception ignored when "
                                    "calling signal handler");
             continue;
         }

Objects/dictobject.c

@@ -7351,7 +7351,7 @@ PyObject_ClearManagedDict(PyObject *obj)
     if (set_or_clear_managed_dict(obj, NULL, true) < 0) {
         /* Must be out of memory */
         assert(PyErr_Occurred() == PyExc_MemoryError);
-        PyErr_FormatUnraisable("Exception ignored on "
+        PyErr_FormatUnraisable("Exception ignored when "
                                "clearing an object managed dict");
         /* Clear the dict */
         PyDictObject *dict = _PyObject_GetManagedDict(obj);

Objects/weakrefobject.c

@@ -1042,7 +1042,7 @@ PyObject_ClearWeakRefs(PyObject *object)
     PyObject *tuple = PyTuple_New(num_weakrefs * 2);
     if (tuple == NULL) {
         _PyWeakref_ClearWeakRefsNoCallbacks(object);
-        PyErr_FormatUnraisable("Exception ignored on clearing object weakrefs");
+        PyErr_FormatUnraisable("Exception ignored when clearing object weakrefs");
         PyErr_SetRaisedException(exc);
         return;
     }

Python/jit.c

@@ -563,7 +563,7 @@ _PyJIT_Free(_PyExecutorObject *executor)
         executor->jit_side_entry = NULL;
         executor->jit_size = 0;
         if (jit_free(memory, size)) {
-            PyErr_FormatUnraisable("Exception ignored on freeing JIT memory");
+            PyErr_FormatUnraisable("Exception ignored when freeing JIT memory");
         }
     }
 }