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-rw-r--r--coverage/control.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/coverage/control.py b/coverage/control.py
index 9dfa59fb..e0e1acbf 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -383,6 +383,8 @@ class Coverage:
if self._debug is not None and self._debug.should('pid'):
msg = f"[{os.getpid()}] {msg}"
warnings.warn(msg, category=CoverageWarning, stacklevel=2)
+ if self._debug is not None:
+ self._debug.write(f"Warning: {msg}\n{short_stack()}")
if once:
self._no_warn_slugs.append(slug)