complain if the codec doesn't return unicode
diff --git a/Lib/test/bad_coding3.py b/Lib/test/bad_coding3.py
new file mode 100644
index 0000000..77836d9
--- /dev/null
+++ b/Lib/test/bad_coding3.py
@@ -0,0 +1,2 @@
+# coding: string-escape
+\x70\x72\x69\x6e\x74\x20\x32\x2b\x32\x0a