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@@ -24,6 +24,11 @@ want to know what's different in 5.0 since 4.5.x, see :ref:`whatsnew5x`.
Unreleased
----------
+- If a 4.x data file is the cause of a "file is not a database" error, then use
+ a more specific error message, "Looks like a coverage 4.x data file, are you
+ mixing versions of coverage?" Helps diagnose the problems described in
+ `issue 886`_.
+
- Measurement contexts and relative file names didn't work together, as
reported in `issue_899`_ and `issue_900`_. This is now fixed, thanks to
David Szotten.
@@ -37,6 +42,7 @@ Unreleased
different drive (`issue 895`_). Thanks, Olivier Grisel.
.. _issue 880: https://github.com/nedbat/coveragepy/issues/880
+.. _issue 886: https://github.com/nedbat/coveragepy/issues/886
.. _issue 895: https://github.com/nedbat/coveragepy/issues/895
.. _issue 899: https://github.com/nedbat/coveragepy/issues/899
.. _issue 900: https://github.com/nedbat/coveragepy/issues/900