The Lambda type should be lambdef, not lambda. Use the grammar types.

jedi/evaluate/docstrings.py

@@ -192,7 +192,7 @@ def follow_param(module_context, param):
                 for p in _evaluate_for_statement_string(module_context, param_str)]
         )
     func = param.get_parent_function()
-    if func.type == 'lambda':
+    if func.type == 'lambdef':
         return set()
 
     types = eval_docstring(func.raw_doc)