The file-rename warning needs to take <string> into account.

1 files changed, 5 insertions, 4 deletions

diff --git a/coverage/control.py b/coverage/control.py
index 48c0c1c..6a03db7 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -453,10 +453,11 @@ class Coverage(object):
         dunder_file = frame.f_globals.get('__file__')
         if dunder_file:
             filename = self._source_for_file(dunder_file)
-            if os.path.basename(original_filename) != os.path.basename(filename):
-                # Files shouldn't be renamed when moved. This happens when
-                # exec'ing code, not sure why yet.
-                self._warn("File was renamed?: %r became %r" % (original_filename, filename))
+            if original_filename and not original_filename.startswith('<'):
+                if os.path.basename(original_filename) != os.path.basename(filename):
+                    # Files shouldn't be renamed when moved. This happens when
+                    # exec'ing code, not sure why yet.
+                    self._warn("File was renamed?: %r became %r" % (original_filename, filename))
 
         if not filename:
             # Empty string is pretty useless.