1 files changed, 22 insertions, 11 deletions

diff --git a/Python/errors.c b/Python/errors.c
index 626b16e46f..53dd9a9650 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -227,12 +227,21 @@ PyErr_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)
        value will be an instance.
     */
     if (PyExceptionClass_Check(type)) {
+        int is_subclass;
+        if (inclass) {
+            is_subclass = PyObject_IsSubclass(inclass, type);
+            if (is_subclass < 0)
+                goto finally;
+        }
+        else
+            is_subclass = 0;
+
         /* if the value was not an instance, or is not an instance
            whose class is (or is derived from) type, then use the
            value as an argument to instantiation of the type
            class.
         */
-        if (!inclass || !PyObject_IsSubclass(inclass, type)) {
+        if (!inclass || !is_subclass) {
             PyObject *args, *res;
 
             if (value == Py_None)
@@ -588,7 +597,7 @@ PyObject *PyErr_SetExcFromWindowsErr(PyObject *exc, int ierr)
 
 PyObject *PyErr_SetFromWindowsErr(int ierr)
 {
-    return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,
+    return PyErr_SetExcFromWindowsErrWithFilename(PyExc_OSError,
                                                   ierr, NULL);
 }
 PyObject *PyErr_SetFromWindowsErrWithFilename(
@@ -597,7 +606,7 @@ PyObject *PyErr_SetFromWindowsErrWithFilename(
 {
     PyObject *name = filename ? PyUnicode_DecodeFSDefault(filename) : NULL;
     PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
-                                                  PyExc_WindowsError,
+                                                  PyExc_OSError,
                                                   ierr, name);
     Py_XDECREF(name);
     return result;
@@ -611,7 +620,7 @@ PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(
                      PyUnicode_FromUnicode(filename, wcslen(filename)) :
              NULL;
     PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(
-                                                  PyExc_WindowsError,
+                                                  PyExc_OSError,
                                                   ierr, name);
     Py_XDECREF(name);
     return result;
@@ -675,6 +684,7 @@ _PyErr_BadInternalCall(const char *filename, int lineno)
 void
 PyErr_BadInternalCall(void)
 {
+    assert(0 && "bad argument to internal function");
     PyErr_Format(PyExc_SystemError,
                  "bad argument to internal function");
 }
@@ -798,7 +808,12 @@ PyErr_WriteUnraisable(PyObject *obj)
     PyErr_Fetch(&t, &v, &tb);
     f = PySys_GetObject("stderr");
     if (f != NULL && f != Py_None) {
-        PyFile_WriteString("Exception ", f);
+        if (obj) {
+            PyFile_WriteString("Exception ignored in: ", f);
+            PyFile_WriteObject(obj, f, 0);
+            PyFile_WriteString("\n", f);
+        }
+        PyTraceBack_Print(tb, f);
         if (t) {
             PyObject* moduleName;
             char* className;
@@ -828,15 +843,11 @@ PyErr_WriteUnraisable(PyObject *obj)
                 PyFile_WriteString(className, f);
             if (v && v != Py_None) {
                 PyFile_WriteString(": ", f);
-                PyFile_WriteObject(v, f, 0);
+                PyFile_WriteObject(v, f, Py_PRINT_RAW);
             }
+            PyFile_WriteString("\n", f);
             Py_XDECREF(moduleName);
         }
-        if (obj) {
-            PyFile_WriteString(" in ", f);
-            PyFile_WriteObject(obj, f, 0);
-        }
-        PyFile_WriteString(" ignored\n", f);
         PyErr_Clear(); /* Just in case */
     }
     Py_XDECREF(t);