Issue #27123: When an exception is raised within the context being
managed by a contextlib.ExitStack() and one of the exit stack
generators catches and raises it in a chain, do not re-raise the
original exception when exiting, let the new chained one through.
This avoids the PEP 479 bug described in issue25782.
diff --git a/Lib/contextlib.py b/Lib/contextlib.py
index 5377987..d44edd6 100644
--- a/Lib/contextlib.py
+++ b/Lib/contextlib.py
@@ -82,6 +82,9 @@
# raised inside the "with" statement from being suppressed.
return exc is not value
except RuntimeError as exc:
+ # Don't re-raise the passed in exception. (issue27112)
+ if exc is value:
+ return False
# Likewise, avoid suppressing if a StopIteration exception
# was passed to throw() and later wrapped into a RuntimeError
# (see PEP 479).