Fixed #1785: module incorrectly excluded from stdlib definition.

Author: timothycrosley

CHANGELOG.md

@@ -8,6 +8,7 @@ Find out more about isort's release policy [here](https://pycqa.github.io/isort/
   - Improved text of skipped file message to mention gitignore feature.
   - Fixed #1779: Pylama integration ignores pylama specific isort config overrides.
   - Fixed #1781: `--from-first` CLI flag shouldn't take any arguments.
+  - Fixed #1785: `_ast` module incorrectly excluded from stdlib definition.
 
 ### 5.9.2 July 8th 2021
   - Improved behavior of `isort --check --atomic` against Cython files.

isort/stdlibs/py27.py

@@ -40,6 +40,7 @@
     "UserString",
     "W",
     "__builtin__",
+    "_ast",
     "_winreg",
     "abc",
     "aepack",

isort/stdlibs/py35.py

@@ -6,6 +6,7 @@
 """
 
 stdlib = {
+    "_ast",
     "_dummy_thread",
     "_thread",
     "abc",

isort/stdlibs/py36.py

@@ -6,6 +6,7 @@
 """
 
 stdlib = {
+    "_ast",
     "_dummy_thread",
     "_thread",
     "abc",

isort/stdlibs/py37.py

@@ -6,6 +6,7 @@
 """
 
 stdlib = {
+    "_ast",
     "_dummy_thread",
     "_thread",
     "abc",

isort/stdlibs/py38.py

@@ -6,6 +6,7 @@
 """
 
 stdlib = {
+    "_ast",
     "_dummy_thread",
     "_thread",
     "abc",

isort/stdlibs/py39.py

@@ -6,6 +6,7 @@
 """
 
 stdlib = {
+    "_ast",
     "_thread",
     "abc",
     "aifc",

scripts/mkstdlibs.py

@@ -31,7 +31,7 @@ class FakeApp:
     invdata = fetch_inventory(FakeApp(), "", url)
 
     # Any modules we want to enforce across Python versions stdlib can be included in set init
-    modules = {"posixpath", "ntpath", "sre_constants", "sre_parse", "sre_compile", "sre"}
+    modules = {"_ast", "posixpath", "ntpath", "sre_constants", "sre_parse", "sre_compile", "sre"}
     for module in invdata["py:module"]:
         root, *_ = module.split(".")
         if root not in ["__future__", "__main__"]: