gh-110721: Remove unused code from suggestions.c after moving PyErr_Display to use the traceback module

Include/internal/pycore_global_strings.h

@@ -653,7 +653,6 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(seek)
         STRUCT_FOR_ID(seekable)
         STRUCT_FOR_ID(selectors)
-        STRUCT_FOR_ID(self)
         STRUCT_FOR_ID(send)
         STRUCT_FOR_ID(sep)
         STRUCT_FOR_ID(sequence)

Lib/traceback.py

@@ -1497,6 +1497,13 @@ def _compute_suggestion_error(exc_value, tb, wrong_name):
             if hasattr(self, wrong_name):
                 return f"self.{wrong_name}"
 
+    try:
+        import _suggestions
+    except ImportError:
+        pass
+    else:
+        return _suggestions._generate_suggestions(d, wrong_name)
+
     # Compute closest match
 
     if len(d) > _MAX_CANDIDATE_ITEMS:

Modules/Setup.bootstrap.in

@@ -11,6 +11,7 @@ faulthandler faulthandler.c
 posix posixmodule.c
 _signal signalmodule.c
 _tracemalloc _tracemalloc.c
+_suggestions _suggestions.c
 
 # modules used by importlib, deepfreeze, freeze, runpy, and sysconfig
 _codecs _codecsmodule.c

Modules/_suggestions.c

@@ -0,0 +1,63 @@
+#include "Python.h"
+#include "pycore_pyerrors.h"
+#include "clinic/_suggestions.c.h"
+
+/*[clinic input]
+module _suggestions
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=e58d81fafad5637b]*/
+
+/*[clinic input]
+_suggestions._generate_suggestions
+    candidates: object
+    item: unicode
+    /
+Returns the candidate in candidates that's closest to item
+[clinic start generated code]*/
+
+static PyObject *
+_suggestions__generate_suggestions_impl(PyObject *module,
+                                        PyObject *candidates, PyObject *item)
+/*[clinic end generated code: output=79be7b653ae5e7ca input=ba2a8dddc654e33a]*/
+{
+   // Check if dir is a list
+    if (!PyList_Check(candidates)) {
+        PyErr_SetString(PyExc_TypeError, "candidates must be a list");
+        return NULL;
+    }
+
+    // Check if all elements in the list are Unicode
+    Py_ssize_t size = PyList_Size(candidates);
+    for (Py_ssize_t i = 0; i < size; ++i) {
+        PyObject *elem = PyList_GetItem(candidates, i);
+        if (!PyUnicode_Check(elem)) {
+            PyErr_SetString(PyExc_TypeError, "all elements in 'candidates' must be strings");
+            return NULL;
+        }
+    }
+
+    PyObject* result =  _Py_CalculateSuggestions(candidates, item);
+    if (!result && !PyErr_Occurred()) {
+        Py_RETURN_NONE;
+    }
+    return result;
+}
+
+
+static PyMethodDef module_methods[] = {
+    _SUGGESTIONS__GENERATE_SUGGESTIONS_METHODDEF
+    {NULL, NULL, 0, NULL} // Sentinel
+};
+
+static struct PyModuleDef suggestions_module = {
+    PyModuleDef_HEAD_INIT,
+    "_suggestions",
+    NULL,
+    -1,
+    module_methods
+};
+
+PyMODINIT_FUNC PyInit__suggestions(void) {
+    return PyModule_Create(&suggestions_module);
+}
+

PCbuild/pythoncore.vcxproj

@@ -424,6 +424,7 @@
     <ClInclude Include="..\Modules\_sre\sre_lib.h" />
     <ClCompile Include="..\Modules\_stat.c" />
     <ClCompile Include="..\Modules\_struct.c" />
+    <ClCompile Include="..\Modules\_suggestions.c" />
     <ClCompile Include="..\Modules\_weakref.c" />
     <ClCompile Include="..\Modules\arraymodule.c" />
     <ClCompile Include="..\Modules\atexitmodule.c" />

PCbuild/pythoncore.vcxproj.filters

@@ -932,6 +932,9 @@
     <ClCompile Include="..\Modules\_struct.c">
       <Filter>Modules</Filter>
     </ClCompile>
+    <ClCompile Include="..\Modules\_suggestions.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
     <ClCompile Include="..\Modules\_weakref.c">
       <Filter>Modules</Filter>
     </ClCompile>