#9018: os.path.normcase() now raises a TypeError if the argument is not str or bytes.
diff --git a/Lib/os2emxpath.py b/Lib/os2emxpath.py
index 184c9b1..0ccbf8a 100644
--- a/Lib/os2emxpath.py
+++ b/Lib/os2emxpath.py
@@ -36,6 +36,9 @@
"""Normalize case of pathname.
Makes all characters lowercase and all altseps into seps."""
+ if not isinstance(s, (bytes, str)):
+ raise TypeError("normcase() argument must be str or bytes, "
+ "not '{}'".format(s.__class__.__name__))
return s.replace('\\', '/').lower()