Fix a recursion issue with nested for loops.

jedi/common.py

@@ -158,3 +158,9 @@ def splitlines(string):
 def unite(iterable):
     """Turns a two dimensional array into a one dimensional."""
     return set(chain.from_iterable(iterable))
+
+
+def to_list(func):
+    def wrapper(*args, **kwargs):
+        return list(func(*args, **kwargs))
+    return wrapper

jedi/evaluate/iterable.py

@@ -30,6 +30,7 @@ from jedi.evaluate import helpers
 from jedi.evaluate.cache import CachedMetaClass, memoize_default
 from jedi.evaluate import analysis
 from jedi.evaluate import pep0484
+from jedi import common
 
 
 class IterableWrapper(tree.Base):
@@ -183,19 +184,19 @@ class Comprehension(IterableWrapper):
         last_comp = list(comp_for.get_comp_fors())[-1]
         return helpers.deep_ast_copy(self._get_comprehension().children[index], parent=last_comp)
 
-    def _iterate(self):
-        def nested(comp_fors):
+    def _nested(self, comp_fors):
+        evaluator = self._evaluator
         comp_for = comp_fors[0]
         input_node = comp_for.children[3]
         input_types = evaluator.eval_element(input_node)
 
         iterated = py__iter__(evaluator, input_types, input_node)
         exprlist = comp_for.children[1]
-            for types in iterated:
+        for i, types in enumerate(iterated):
             evaluator.predefined_if_name_dict_dict[comp_for] = \
                 unpack_tuple_to_dict(evaluator, types, exprlist)
             try:
-                    for result in nested(comp_fors[1:]):
+                for result in self._nested(comp_fors[1:]):
                     yield result
             except IndexError:
                 iterated = evaluator.eval_element(self._eval_node())
@@ -206,9 +207,11 @@ class Comprehension(IterableWrapper):
             finally:
                 del evaluator.predefined_if_name_dict_dict[comp_for]
 
-        evaluator = self._evaluator
-        comp_fors = list(self._get_comp_for().get_comp_fors())
-        for result in nested(comp_fors):
+    @memoize_default(default=[])
+    @common.to_list
+    def _iterate(self):
+        comp_fors = tuple(self._get_comp_for().get_comp_fors())
+        for result in self._nested(comp_fors):
             yield result
 
     def py__iter__(self):

test/completion/recursion.py

@@ -37,3 +37,15 @@ def recursion1(foo):
 
 #? int()
 recursion1([1,2])[0]
+
+
+class FooListComp():
+    def __init__(self):
+        self.recursive = [1]
+
+    def annoying(self):
+        self.recursive = [x for x in self.recursive]
+
+
+#? int()
+FooListComp().recursive[0]