better error message

theano/gof/compiledir.py

@@ -206,8 +206,7 @@ def filter_compiledir(path):
             if os.path.exists(init_file):
                 pass  # has already been created
             else:
-                if os.path.exists(path):
-                    e.args += ('%s does not exist..' % path,)
+                e.args += ('%s exist? %s' % (path, os.path.exists(path)),)
                 raise
     return path
 

theano/gof/lazylinker_c.py

@@ -59,7 +59,8 @@ try:
             if os.path.exists(init_file):
                 pass  # has already been created
             else:
-                e.args += ('%s exist?' % os.path.exists(location),)
+                e.args += ('%s exist? %s' % (location,
+                                             os.path.exists(location)),)
                 raise
 
     _need_reload = False