Add ast-serialize as an optional dependency

Author: ilevkivskyi

.github/workflows/test.yml

@@ -106,20 +106,20 @@ jobs:
           os: ubuntu-24.04-arm
           toxenv: py
           tox_extra_args: "-n 4 --mypy-num-workers=4 mypy/test/testcheck.py"
-          dev_ast_serialize: true
+          ast_serialize: true
         - name: Parallel tests with py314-ubuntu, mypyc-compiled
           python: '3.14'
           os: ubuntu-24.04-arm
           toxenv: py
           tox_extra_args: "-n 4 --mypy-num-workers=4 mypy/test/testcheck.py"
           test_mypyc: true
-          dev_ast_serialize: true
+          ast_serialize: true
         - name: Parallel tests with py314-windows-64, interpreted
           python: '3.14'
           os: windows-latest
           toxenv: py
           tox_extra_args: "-n 2 --mypy-num-workers=2 mypy/test/testcheck.py -k 'incremental or modules or classes'"
-          dev_ast_serialize: true
+          ast_serialize: true
 
         - name: Type check our own code (py310-ubuntu)
           python: '3.10'
@@ -142,7 +142,7 @@ jobs:
     timeout-minutes: 60
     env:
       TOX_SKIP_MISSING_INTERPRETERS: False
-      VIRTUALENV_SYSTEM_SITE_PACKAGES: ${{ matrix.dev_ast_serialize && 1 || 0 }}
+      VIRTUALENV_SYSTEM_SITE_PACKAGES: ${{ matrix.ast_serialize && 1 || 0 }}
       # Rich (pip) -- Disable color for windows + pytest
       FORCE_COLOR: ${{ !(startsWith(matrix.os, 'windows-') && startsWith(matrix.toxenv, 'py')) && 1 || 0 }}
       # Tox
@@ -217,10 +217,10 @@ jobs:
         pip install -r test-requirements.txt
         CC=clang MYPYC_OPT_LEVEL=0 MYPY_USE_MYPYC=1 pip install -e .
 
-    # To speed-up process until ast_serialize is on PyPI.
-    - name: Install pinned ast-serialize
-      if: ${{ matrix.dev_ast_serialize }}
-      run: pip install ast-serialize@git+https://github.com/mypyc/ast_serialize.git@052c5bfa3b2a5bf07c0b163ccbe2c5ccbfae9ac5
+    # It is an optional dependency (for now).
+    - name: Install ast-serialize
+      if: ${{ matrix.ast_serialize }}
+      run: pip install ast-serialize>=0.1.1,<1.0.0
 
     - name: Setup tox environment
       run: |

pyproject.toml

@@ -64,6 +64,7 @@ python2 = []
 reports = ["lxml"]
 install-types = ["pip"]
 faster-cache = ["orjson"]
+native-parse = ["ast-serialize>=0.1.1,<1.0.0"]
 
 [project.urls]
 Homepage = "https://www.mypy-lang.org/"

test-data/unit/check-overloading.test

@@ -6165,7 +6165,7 @@ reveal_type(f3(A()))  # E: No overload variant of "f3" matches argument type "A"
     # N: Revealed type is "Any"
 reveal_type(f3(B()))  # N: Revealed type is "__main__.B"
 
-[case testOverloadIfSplitFunctionDef]
+[case testOverloadIfSplitFunctionDef_no_native_parse]
 # flags: --always-true True --always-false False
 from typing import overload