enable % formatting of byte strings by providing a __str__() special method that encodes to unicode

Cython/Compiler/ModuleNode.py

@@ -592,7 +592,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         includes = []
         for filename in env.include_files:
             # fake decoding of filenames to their original byte sequence
-            code.putln('#include "%s"' % filename.as_unicode())
+            code.putln('#include "%s"' % filename)
     
     def generate_filename_table(self, code):
         code.putln("")

Cython/Compiler/StringEncoding.py

@@ -89,9 +89,9 @@ class BytesLiteral(_bytes):
     def utf8encode(self):
         assert False, "this is not a unicode string: %r" % self
 
-    def as_unicode(self):
-        """Returns a Unicode sequence that matches the byte sequence
-        of this literal.
+    def __str__(self):
+        """Fake-decode the byte string to unicode to support %
+        formatting of unicode strings.
         """
         return self.decode('ISO-8859-1')