check baseException_repr failure, add 3.15rst

Author: ynir3

Doc/whatsnew/3.15.rst

@@ -200,6 +200,10 @@ Other language changes
 * Several error messages incorrectly using the term "argument" have been corrected.
   (Contributed by Stan Ulbrych in :gh:`133382`.)
 
+* The :meth:`repr` of :class:`ImportError` and :class:`ModuleNotFoundError` now
+  contains attributes name and path.
+  (Contributed by Serhiy Storchaka, Oleg Iarygin, and Yoav Nir in :gh:`74185`.)
+
 
 New modules
 ===========

Lib/test/test_exceptions.py

@@ -2640,5 +2640,6 @@ def test_ModuleNotFoundError_repr_with_failed_import(self):
         self.assertEqual(repr(cm.exception),
             "ModuleNotFoundError(\"No module named 'does_not_exist'\", name='does_not_exist')")
 
+
 if __name__ == '__main__':
     unittest.main()

Misc/NEWS.d/next/Core_and_Builtins/2025-07-19-10-35-31.gh-issue-74185.7hPCA5.rst

@@ -1,2 +1,3 @@
-:meth:`repr` of :class:`ImportError` now contains attributes name and path.
+The :meth:`repr` of :class:`ImportError` and :class:`ModuleNotFoundError` now
+contains attributes name and path.
 Patch by Serhiy Storchaka, Oleg Iarygin, and Yoav Nir

Objects/exceptions.c

@@ -1874,6 +1874,9 @@ ImportError_repr(PyObject *self)
         goto error;
     }
     PyObject *r = BaseException_repr(self);
+    if (r == NULL) {
+        goto error;
+    }
     if (PyUnicodeWriter_WriteSubstring(
         writer, r, 0, PyUnicode_GET_LENGTH(r) - 1) < 0)
     {
@@ -1903,7 +1906,7 @@ ImportError_repr(PyObject *self)
         }
     }
 
-    if (PyUnicodeWriter_WriteASCII(writer, ")", 1) < 0) {
+    if (PyUnicodeWriter_WriteChar(writer, ")") < 0) {
         goto error;
     }