Fix a recursion error, fixes #1173

jedi/evaluate/dynamic.py

@@ -28,8 +28,8 @@ from jedi.evaluate.helpers import is_stdlib_path
 from jedi.evaluate.utils import to_list
 from jedi.parser_utils import get_parent_scope
 from jedi.evaluate.context import ModuleContext, instance
-from jedi.evaluate.base_context import ContextSet
+from jedi.evaluate.base_context import ContextSet, NO_CONTEXTS
-
+from jedi.evaluate import recursion
 
 
 MAX_PARAM_SEARCHES = 20
@@ -39,11 +39,19 @@ class MergedExecutedParams(object):
     """
     Simulates being a parameter while actually just being multiple params.
     """
-    def __init__(self, executed_params):
+
+    def __init__(self, evaluator, executed_params):
+        self.evaluator = evaluator
         self._executed_params = executed_params
 
     def infer(self):
-        return ContextSet.from_sets(p.infer() for p in self._executed_params)
+        with recursion.execution_allowed(self.evaluator, self) as allowed:
+            # We need to catch recursions that may occur, because an
+            # anonymous functions can create an anonymous parameter that is
+            # more or less self referencing.
+            if allowed:
+                return ContextSet.from_sets(p.infer() for p in self._executed_params)
+            return NO_CONTEXTS
 
 
 @debug.increase_indent
@@ -90,15 +98,11 @@ def search_params(evaluator, execution_context, funcdef):
                 string_name=string_name,
             )
             if function_executions:
-                if len(function_executions) == 1:
-                    # Don't need to wrap this one.
-                    return function_executions[0].get_params()
-
                 zipped_params = zip(*list(
                     function_execution.get_params()
                     for function_execution in function_executions
                 ))
-                params = [MergedExecutedParams(executed_params) for executed_params in zipped_params]
+                params = [MergedExecutedParams(evaluator, executed_params) for executed_params in zipped_params]
                 # Evaluate the ExecutedParams to types.
             else:
                 return create_default_params(execution_context, funcdef)

jedi/evaluate/recursion.py

@@ -65,7 +65,7 @@ def execution_allowed(evaluator, node):
 
     if node in pushed_nodes:
         debug.warning('catched stmt recursion: %s @%s', node,
-                      node.start_pos)
+                      getattr(node, 'start_pos', None))
         yield False
     else:
         try:
@@ -77,14 +77,14 @@ def execution_allowed(evaluator, node):
 
 def execution_recursion_decorator(default=NO_CONTEXTS):
     def decorator(func):
-        def wrapper(execution, **kwargs):
+        def wrapper(self, **kwargs):
-            detector = execution.evaluator.execution_recursion_detector
+            detector = self.evaluator.execution_recursion_detector
-            allowed = detector.push_execution(execution)
+            allowed = detector.push_execution(self)
             try:
                 if allowed:
                     result = default
                 else:
-                    result = func(execution, **kwargs)
+                    result = func(self, **kwargs)
             finally:
                 detector.pop_execution()
             return result

test/completion/recursion.py

@@ -76,3 +76,18 @@ class InstanceAttributeIfs:
 InstanceAttributeIfs().a1
 #? int() str()
 InstanceAttributeIfs().a2
+
+
+
+class A:
+    def a(self, b):
+        for x in [self.a(i) for i in b]:
+            #?
+            x
+
+class B:
+    def a(self, b):
+        for i in b:
+            for i in self.a(i):
+                #?
+                yield i