fix: with-exiting changed in 3.12.6. #1880

CHANGES.rst

@@ -23,7 +23,9 @@ upgrading your version of coverage.py.
 Unreleased
 ----------
 
-Nothing yet.
+- fix: fine-tuned the exact Python version (3.12.6) when exiting from ``with``
+  statements changed how they traced.  This affected whether people saw the
+  fix for `issue 1880`_.
 
 
 .. start-releases

coverage/env.py

@@ -83,7 +83,7 @@ class PYBEHAVIOR:
 
     # When leaving a with-block, do we visit the with-line exactly,
     # or the inner-most context manager?
-    exit_with_through_ctxmgr = (PYVERSION >= (3, 12))
+    exit_with_through_ctxmgr = (PYVERSION >= (3, 12, 6))
 
     # Match-case construct.
     match_case = (PYVERSION >= (3, 10))

tests/test_arcs.py

@@ -363,7 +363,6 @@ def test_multiline_with(self) -> None:
             branchz_missing="",
         )
 
-
     def test_multi_multiline_with(self) -> None:
         # https://github.com/nedbat/coveragepy/issues/1880
         self.check_coverage("""\
@@ -382,6 +381,22 @@ def test_multi_multiline_with(self) -> None:
             branchz_missing="",
         )
 
+    def test_multi_multiline_with_backslask(self) -> None:
+        # https://github.com/nedbat/coveragepy/issues/1880
+        self.check_coverage("""\
+            import contextlib, itertools
+            nums = itertools.count()
+            with contextlib.nullcontext() as x, \\
+                contextlib.nullcontext() as y, \\
+                contextlib.nullcontext() as z:
+                while next(nums) < 6:
+                    y = 7
+            z = 8
+            """,
+            branchz="67 68",
+            branchz_missing="",
+        )
+
 
 class LoopArcTest(CoverageTest):
     """Arc-measuring tests involving loops."""