Fix crash in multiple assignment when "__iter__" returns Any (python#7462)

JukkaL · web-flow · commit 680f9bd9a163 · 2019-09-05T14:44:56.000+03:00
Fixes a regression introduced in commit f9396ef.
diff --git a/mypy/checker.py b/mypy/checker.py
@@ -4075,7 +4075,7 @@ def iterable_item_type(self, instance: Instance) -> Type:
             if isinstance(ret_type, Instance):
                 iterator = map_instance_to_supertype(ret_type,
                                                      self.lookup_typeinfo('typing.Iterator'))
-            item_type = iterator.args[0]
+                item_type = iterator.args[0]
         return item_type
 
     def function_type(self, func: FuncBase) -> FunctionLike:
diff --git a/test-data/unit/check-generics.test b/test-data/unit/check-generics.test
@@ -2053,3 +2053,12 @@ class C(Generic[T]):
 def func(x: S) -> S:
     return C[S].get()
 [builtins fixtures/classmethod.pyi]
+
+[case testMultipleAssignmentFromAnyIterable]
+from typing import Any
+class A:
+    def __iter__(self) -> Any: ...
+
+x, y = A()
+reveal_type(x)  # N: Revealed type is 'Any'
+reveal_type(y)  # N: Revealed type is 'Any'
