No need to pass the writer - just invoke it directly.

setuptools/command/easy_install.py

@@ -1906,16 +1906,16 @@ class ScriptWriter(object):
         """
         writer = cls.get_writer(wininst)
         header = get_script_header("", executable, wininst)
-        return cls._gen_args(dist, writer, header)
+        return writer._gen_args(dist, header)
 
     @classmethod
-    def _gen_args(cls, dist, writer, header):
+    def _gen_args(cls, dist, header):
         spec = str(dist.as_requirement())
         for type_ in 'console', 'gui':
             group = type_ + '_scripts'
             for name, ep in dist.get_entry_map(group).items():
-                script_text = writer.template % locals()
-                for res in writer._get_script_args(type_, name, header,
+                script_text = cls.template % locals()
+                for res in cls._get_script_args(type_, name, header,
                         script_text):
                     yield res