Mention %s change in abstract. Fix bug in code (found by Osvaldo Santana

Neto).

pep-0349.txt

@@ -15,9 +15,12 @@ Abstract
 
     This PEP proposes the introduction of a new built-in function,
     text(), that provides a way of generating a string representation
-    of an object.  This function would make it easier to write library
-    code that processes string data without forcing the use of a
-    particular string type.
+    of an object without forcing the result to be a particular string
+    type.  In addition, the behavior %s format specifier would be
+    changed to call text() on the argument.  These two changes would
+    make it easier to write library code that can be used by
+    applications that use only the str type and by others that also use
+    the unicode type.
 
 
 Rationale
@@ -90,7 +93,7 @@ Specification
             if isinstance(s, basestring):
                 return s
             r = s.__str__()
-            if not isinstance(s, basestring):
+            if not isinstance(r, basestring):
                 raise TypeError('__str__ returned non-string')
             return r