--- a/mercurial/win32.py	Fri Mar 27 14:11:13 2015 -0700
+++ b/mercurial/win32.py	Sat Mar 28 11:19:34 2015 +0100
@@ -279,7 +279,7 @@
     buf = ctypes.create_string_buffer(size + 1)
     len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size)
     if len == 0:
-        raise ctypes.WinError()
+        raise ctypes.WinError() # Note: WinError is a function
     elif len == size:
         raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER)
     return buf.value