diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 5da340e1..30a5587e 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -497,7 +497,7 @@ class Evaluator(object):
             return [TreeNameDefinition(context, name)]
         elif par.type == 'param' and par.name:
             return [ParamName(context, name)]
-        elif isinstance(par, (tree.Param, tree.Function, tree.Class)) and par.name is name:
+        elif par.type in ('param', 'funcdef', 'classdef') and par.name is name:
             return [TreeNameDefinition(context, name)]
         elif isinstance(stmt, tree.Import):
             module_names = imports.infer_import(context, name, is_goto=True)
diff --git a/jedi/parser/python/tree.py b/jedi/parser/python/tree.py
index 56706324..0d108212 100644
--- a/jedi/parser/python/tree.py
+++ b/jedi/parser/python/tree.py
@@ -655,6 +655,7 @@ class Lambda(Function):
         return self.children[1:-2]
 
     def is_generator(self):
+        # TODO this is actually not 100% true.
         return False
 
     @property