Merge pull request #86 from alexmojaki/fix_3.12.6

fix: backward compatibility fix for changed source positions in 3.12.6

executing/_position_node_finder.py

@@ -242,6 +242,66 @@ def fix_result(
             # keeping the old behaviour makes it possible to distinguish both cases.
 
             return node.parent
+
+        if (
+            sys.version_info >= (3, 12, 6)
+            and instruction.opname in ("GET_ITER", "FOR_ITER")
+            and isinstance(
+                node.parent.parent,
+                (ast.ListComp, ast.SetComp, ast.DictComp, ast.GeneratorExp),
+            )
+            and isinstance(node.parent,ast.comprehension)
+            and node is node.parent.iter
+        ):
+            # same as above but only for comprehensions, see:
+            # https://github.com/python/cpython/issues/123142
+
+            return node.parent.parent
+
+        if sys.version_info >= (3, 12,6) and instruction.opname == "CALL":
+            before = self.instruction_before(instruction)
+            if (
+                before is not None
+                and before.opname == "LOAD_CONST"
+                and before.positions == instruction.positions
+                and isinstance(node.parent, ast.withitem)
+                and node is node.parent.context_expr
+            ):
+                # node positions for with-statements have change
+                # and is now equal to the expression which created the context-manager
+                # https://github.com/python/cpython/pull/120763
+
+                # with context_manager:
+                #     ...
+
+                # but there is one problem to distinguish call-expressions from __exit__()
+
+                # with context_manager():
+                #     ...
+
+                # the call for __exit__
+
+                # 20  1:5    1:22  LOAD_CONST(None)
+                # 22  1:5    1:22  LOAD_CONST(None)
+                # 24  1:5    1:22  LOAD_CONST(None)
+                # 26  1:5    1:22  CALL()         # <-- same source range as context_manager()
+
+                # but we can use the fact that the previous load for None
+                # has the same source range as the call, wich can not happen for normal calls
+
+                # we return the same ast.With statement at the and to preserve backward compatibility
+
+                return node.parent.parent
+
+        if (
+            sys.version_info >= (3, 12,6)
+            and instruction.opname == "BEFORE_WITH"
+            and isinstance(node.parent, ast.withitem)
+            and node is node.parent.context_expr
+        ):
+            # handle positions changes for __enter__
+            return node.parent.parent
+
         return node
 
     def known_issues(self, node: EnhancedAST, instruction: dis.Instruction) -> None:
@@ -880,6 +940,11 @@ def node_match(node_type: Union[Type, Tuple[Type, ...]], **kwargs: Any) -> bool:
     def instruction(self, index: int) -> Optional[dis.Instruction]:
         return self.bc_dict.get(index,None)
 
+    def instruction_before(
+        self, instruction: dis.Instruction
+    ) -> Optional[dis.Instruction]:
+        return self.bc_dict.get(instruction.offset - 2, None)
+
     def opname(self, index: int) -> str:
         i=self.instruction(index)
         if i is None:

tests/generate_small_sample.py

@@ -18,6 +18,7 @@
 from rich.syntax import Syntax
 from rich.console import Console
 import argparse
+import ast
 
 last_samples_dir = Path(__file__).parent / "last_samples"
 last_samples_dir.mkdir(exist_ok=True)
@@ -63,6 +64,11 @@ def test_file(filename: Path):
             delattr(Source, cache_name)
 
     test = TestFiles()
+    try:
+        ast.parse(code)
+    except (RecursionError,SyntaxError):
+        return True
+
     try:
         with open(os.devnull, "w") as dev_null:
             with contextlib.redirect_stderr(dev_null):
@@ -122,9 +128,6 @@ def main():
                     break_file.unlink()
                     sys.exit(0)
 
-                if time.time() > end_time:
-                    print("Timeout")
-                    sys.exit(0)
 
                 if not result:
                     print(f"{filename} is failing the tests -> minimize\n")

tests/small_samples/3e40f2921fbaf6ccbabb2fa5c3cd3a42b54914d66f7a67f8b2ade36f89ed761b.py

@@ -0,0 +1,3 @@
+async def wait():
+    async with something:
+        pass

tests/test_main.py

@@ -609,6 +609,11 @@ def __next__(self):
             assert {i: i for i in iter_test(ast.DictComp)} == {1: 1, 2: 2}
             assert list(i for i in iter_test(ast.GeneratorExp)) == [1, 2]
 
+            assert [i for j in [0] for i in iter_test(ast.ListComp)] == [1, 2]
+            assert {i for j in [0] for i in iter_test(ast.SetComp)} == {1, 2}
+            assert {i: i for j in [0] for i in iter_test(ast.DictComp)} == {1: 1, 2: 2}
+            assert list(i for j in [0] for i in iter_test(ast.GeneratorExp)) == [1, 2]
+
             for i in iter_test(ast.For):
                 assert i in (1, 2)