[fix] Use requirement.key for index lookup

src/zc/buildout/easy_install.py

@@ -352,7 +352,7 @@ class Installer(object):
         return '\n  '.join(output)
 
     def _satisfied(self, req, source=None):
-        dists = [dist for dist in self._env[req.project_name] if dist in req]
+        dists = [dist for dist in self._env[req.key] if dist in req]
         if not dists:
             logger.debug('We have no distributions for %s that satisfies %r.',
                          req.project_name, str(req))
@@ -510,7 +510,7 @@ class Installer(object):
                 if operator == '==':
                     # But first, avoid any network access by checking local
                     # urls. PackageIndex.add_find_links scans them immediately.
-                    dists = [dist for dist in index[requirement.project_name]
+                    dists = [dist for dist in index[requirement.key]
                         if dist in requirement and filter_precedence(dist) and (
                             FILE_SCHEME(dist.location) or
                             not URL_SCHEME(dist.location))]
@@ -543,7 +543,7 @@ class Installer(object):
             return None
 
         # Filter the available dists for the requirement and source flag
-        dists = [dist for dist in index[requirement.project_name]
+        dists = [dist for dist in index[requirement.key]
                       if dist in requirement and filter_precedence(dist)]
 
         # If we prefer final dists, filter for final and use the