Extract _requirement_spec method for rendering the requirement specification for scripts. Ref #439.

setuptools/command/easy_install.py

@@ -766,7 +766,7 @@ class easy_install(Command):
 
     def install_script(self, dist, script_name, script_text, dev_path=None):
         """Generate a legacy script wrapper and install it"""
-        spec = str(dist.as_requirement())
+        spec = self._requirement_spec(dist)
         is_script = is_python_script(script_text, script_name)
 
         if is_script:
@@ -774,6 +774,10 @@ class easy_install(Command):
                            self._load_template(dev_path) % locals())
         self.write_script(script_name, _to_ascii(script_text), 'b')
 
+    @staticmethod
+    def _requirement_spec(dist):
+        return str(dist.as_requirement())
+
     @staticmethod
     def _load_template(dev_path):
         """