From 7ae95a182aabdfe4756db791c5a44be70fd62559 Mon Sep 17 00:00:00 2001
From: Ivan Levkivskyi <levkivskyi@gmail.com>
Date: Sun, 9 Oct 2022 21:08:38 +0100
Subject: [PATCH 1/2] Temporarily put back --enable-recursive-aliases

---
 mypy/main.py    | 10 ++++++++++
 mypy/options.py |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/mypy/main.py b/mypy/main.py
index e8be9f0d01fe..12ea8c46ae6c 100644
--- a/mypy/main.py
+++ b/mypy/main.py
@@ -979,6 +979,10 @@ def add_invertible_flag(
         action="store_true",
         help="Disable experimental support for recursive type aliases",
     )
+    # Deprecated reverse variant of the above.
+    internals_group.add_argument(
+        "--enable-recursive-aliases", action="store_true", help=argparse.SUPPRESS
+    )
     internals_group.add_argument(
         "--custom-typeshed-dir", metavar="DIR", help="Use the custom typeshed in DIR"
     )
@@ -1318,6 +1322,12 @@ def set_strict_flags() -> None:
     if options.logical_deps:
         options.cache_fine_grained = True
 
+    if options.enable_recursive_aliases:
+        print(
+            "Warning: --enable-recursive-aliases is deprecated;"
+            " recursive types are enabled by default"
+        )
+
     # Set target.
     if special_opts.modules + special_opts.packages:
         options.build_type = BuildType.MODULE
diff --git a/mypy/options.py b/mypy/options.py
index 1910f9532913..e37a4017e14f 100644
--- a/mypy/options.py
+++ b/mypy/options.py
@@ -320,6 +320,8 @@ def __init__(self) -> None:
         self.many_errors_threshold = defaults.MANY_ERRORS_THRESHOLD
         # Disable recursive type aliases (currently experimental)
         self.disable_recursive_aliases = False
+        # Deprecated reverse version of the above, do not use.
+        self.enable_recursive_aliases = False
 
     # To avoid breaking plugin compatibility, keep providing new_semantic_analyzer
     @property

From e930a7e45b39ef202487a36a725d7f2490029d92 Mon Sep 17 00:00:00 2001
From: Ivan Levkivskyi <levkivskyi@gmail.com>
Date: Sun, 9 Oct 2022 21:13:06 +0100
Subject: [PATCH 2/2] Add a test

---
 test-data/unit/cmdline.test | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test-data/unit/cmdline.test b/test-data/unit/cmdline.test
index 168cf0a8d738..b600f21edbdc 100644
--- a/test-data/unit/cmdline.test
+++ b/test-data/unit/cmdline.test
@@ -1474,3 +1474,11 @@ note: A user-defined top-level module with name "typing" is not supported
 [out]
 Failed to find builtin module mypy_extensions, perhaps typeshed is broken?
 == Return code: 2
+
+[case testRecursiveAliasesFlagDeprecated]
+# cmd: mypy --enable-recursive-aliases a.py
+[file a.py]
+pass
+[out]
+Warning: --enable-recursive-aliases is deprecated; recursive types are enabled by default
+== Return code: 0