diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 735c6596..0e110e3d 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -270,8 +270,8 @@ class Evaluator(object):
             if element.value in ('False', 'True', 'None'):
                 types.add(compiled.builtin_from_name(self, element.value))
             # else: print e.g. could be evaluated like this in Python 2.7
-        elif element.isinstance(tree.Lambda):
-            types = set([er.LambdaWrapper(self, element)])
+        elif isinstance(element, tree.Lambda):
+            types = set([er.LambdaWrapper(self, context, element)])
         elif element.isinstance(er.LambdaWrapper):
             types = set([element])  # TODO this is no real evaluation.
         elif element.type == 'expr_stmt':
diff --git a/jedi/evaluate/dynamic.py b/jedi/evaluate/dynamic.py
index 2c7beeb4..6458168f 100644
--- a/jedi/evaluate/dynamic.py
+++ b/jedi/evaluate/dynamic.py
@@ -104,21 +104,22 @@ def _search_function_executions(evaluator, module_context, funcdef):
     from jedi.evaluate import representation as er
 
     def get_possible_nodes(module_context, func_name):
-            try:
-                names = module_context.module_node.used_names[func_name]
-            except KeyError:
-                return
+        if not isinstance(module_context, er.ModuleContext):
+            return
+        try:
+            names = module_context.module_node.used_names[func_name]
+        except KeyError:
+            return
 
-            for name in names:
-                bracket = name.get_next_leaf()
-                trailer = bracket.parent
-                if trailer.type == 'trailer' and bracket == '(':
-                    yield name, trailer
+        for name in names:
+            bracket = name.get_next_leaf()
+            trailer = bracket.parent
+            if trailer.type == 'trailer' and bracket == '(':
+                yield name, trailer
 
     func_name = unicode(funcdef.name)
     compare_node = funcdef
     if func_name == '__init__':
-        raise NotImplementedError
         cls = funcdef.get_parent_scope()
         if isinstance(cls, tree.Class):
             func_name = unicode(cls.name)
diff --git a/jedi/evaluate/helpers.py b/jedi/evaluate/helpers.py
index 77e6d2fa..8694d586 100644
--- a/jedi/evaluate/helpers.py
+++ b/jedi/evaluate/helpers.py
@@ -64,6 +64,7 @@ def deep_ast_copy(obj, parent=None, new_elements=None):
 
     if parent is not None:
         new_obj.parent = parent
+    raise NotImplementedError
     return new_obj
 
 
@@ -94,12 +95,14 @@ def call_of_leaf(leaf, cut_own_trailer=False):
 
     power = trailer.parent
     index = power.children.index(trailer)
-    power = deep_ast_copy(power)
     if cut_own_trailer:
         cut = index
     else:
         cut = index + 1
-    power.children[cut:] = []
+
+    new_power = copy.copy(power)
+    new_power.children = list(new_power.children)
+    new_power.children[cut:] = []
 
     if power.type == 'error_node':
         start = index
diff --git a/jedi/evaluate/instance.py b/jedi/evaluate/instance.py
index 3dcab48c..a9dbebe4 100644
--- a/jedi/evaluate/instance.py
+++ b/jedi/evaluate/instance.py
@@ -375,7 +375,12 @@ class ParamArguments(object):
             self._class_context,
             self._funcdef
         )
+        is_first = True
         for p in params:
+            # TODO Yeah, here at last, the class seems to be really wrong.
+            if is_first:
+                is_first = False
+                continue
             yield None, self.LazyParamContext(p)
 
 
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index 6c50af43..9c679e49 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -209,6 +209,7 @@ class Comprehension(AbstractSequence):
             # InstanceElement anyway, I don't care.
             node = node.var
         last_comp = list(comp_for.get_comp_fors())[-1]
+        raise NotImplementedError('should not need to copy...')
         return helpers.deep_ast_copy(node, parent=last_comp)
 
     def _nested(self, comp_fors):
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index 9b8096f9..fa64f3a2 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -598,8 +598,7 @@ class FunctionContext(use_metaclass(CachedMetaClass, context.TreeContext, Wrappe
 
 
 class LambdaWrapper(FunctionContext):
-    def get_decorated_func(self):
-        return self
+    pass
 
 
 class FunctionExecutionContext(Executed):
@@ -638,8 +637,8 @@ class FunctionExecutionContext(Executed):
     @recursion.execution_recursion_decorator
     def get_return_values(self, check_yields=False):
         funcdef = self.funcdef
-        if funcdef.type in ('lambdef', 'lambdef_nocond'):
-            return self.evaluator.eval_element(self.children[-1])
+        if isinstance(funcdef, tree.Lambda):
+            return self.evaluator.eval_element(self, funcdef.children[-1])
 
         """
         if func.listeners:
@@ -821,7 +820,7 @@ class ModuleContext(use_metaclass(CachedMetaClass, context.TreeContext, Wrapper)
                 name = i.star_import_name()
                 new = imports.ImportWrapper(self, name).follow()
                 for module in new:
-                    if isinstance(module, tree.Module):
+                    if isinstance(module, ModuleContext):
                         modules += module.star_imports()
                 modules += new
         return modules