Fix compilation under recent mypyc (#7)

Author: elprans

.github/workflows/release.yml

@@ -94,7 +94,7 @@ jobs:
           fetch-depth: 50
           submodules: true
 
-      - uses: pypa/cibuildwheel@v2.1.1
+      - uses: pypa/cibuildwheel@v2.4.0
         env:
           CIBW_BUILD_VERBOSITY: 1
           CIBW_BUILD: ${{ matrix.cibw_python }}

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10.0-rc.1]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
         build: ["mypyc", "pure-python"]
 
     env:

parsing/automaton.py

@@ -280,6 +280,18 @@ class Spec(interfaces.Spec):
     class needs in order to parse input.  Parser generation results in a
     Spec instance, which can then be shared by multiple Parser instances."""
 
+    __deletable__ = [
+        '_itemSets',
+        '_itemSetsHash',
+        '_nonterms',
+        '_precedences',
+        '_productions',
+        '_startSym',
+        '_startProd',
+        '_startState',
+        '_tokens',
+    ]
+
     _sym2spec: dict[type[Symbol], SymbolSpec]
 
     def sym_spec(self, sym: Symbol) -> SymbolSpec:

pyproject.toml

@@ -1,6 +1,3 @@
-[project]
-requires-python = ">=3.7"
-
 [build-system]
 requires = ["setuptools>=42", "wheel"]
 build-backend = "setuptools.build_meta"