1 files changed, 18 insertions, 1 deletions
diff --git a/metacov.ini b/metacov.ini
index 23806587..b25af6eb 100644
--- a/metacov.ini
+++ b/metacov.ini
@@ -14,11 +14,28 @@ source =
 # We set a different pragma so our code won't be confused with test code.
 exclude_lines =
     pragma: not covered
+
+    # Lines in test code that isn't covered: we are nested inside ourselves.
     pragma: nested
+
+    # Lines that are only executed when we are debugging coverage.py.
     def __repr__
-    raise AssertionError
     pragma: debugging
+
+    # Lines that are only executed when we are not testing coverage.py.
+    pragma: not testing
+
+    # Lines that we can't run during metacov.
+    pragma: no metacov
+
+    # These lines only happen if tests fail.
+    raise AssertionError
     pragma: only failure
+
+    # OS error conditions that we can't (or don't care to) replicate.
+    pragma: cant happen
+
+    # Jython needs special care.
     pragma: only jython
     skip.*Jython