Merge branch 'master' into feature/implicit-bootstrapfeature/implicit-bootstrap

1 files changed, 9 insertions, 3 deletions

diff --git a/setuptools/lib2to3_ex.py b/setuptools/lib2to3_ex.py
index 4b1a73fe..c176abf6 100644
--- a/setuptools/lib2to3_ex.py
+++ b/setuptools/lib2to3_ex.py
@@ -2,16 +2,15 @@
 Customized Mixin2to3 support:
 
  - adds support for converting doctests
-
-
-This module raises an ImportError on Python 2.
 """
 
+import warnings
 from distutils.util import Mixin2to3 as _Mixin2to3
 from distutils import log
 from lib2to3.refactor import RefactoringTool, get_fixers_from_package
 
 import setuptools
+from ._deprecation_warning import SetuptoolsDeprecationWarning
 
 
 class DistutilsRefactoringTool(RefactoringTool):
@@ -33,6 +32,13 @@ class Mixin2to3(_Mixin2to3):
             return
         if not files:
             return
+
+        warnings.warn(
+            "2to3 support is deprecated. If the project still "
+            "requires Python 2 support, please migrate to "
+            "a single-codebase solution or employ an "
+            "independent conversion process.",
+            SetuptoolsDeprecationWarning)
         log.info("Fixing " + " ".join(files))
         self.__build_fixer_names()
         self.__exclude_fixers()