Fix a recursion on imports, fixes #1677

jedi/inference/names.py

@@ -7,6 +7,7 @@ from parso.tree import search_ancestor
 from jedi.parser_utils import find_statement_documentation, clean_scope_docstring
 from jedi.inference.utils import unite
 from jedi.inference.base_value import ValueSet, NO_VALUES
+from jedi.inference.cache import inference_state_method_cache
 from jedi.inference import docstrings
 from jedi.cache import memoize_method
 from jedi.inference.helpers import deep_ast_copy, infer_call_of_leaf
@@ -331,6 +332,12 @@ class TreeNameDefinition(AbstractTreeName):
             node = node.parent
         return indexes
 
+    @property
+    def inference_state(self):
+        # Used by the cache function below
+        return self.parent_context.inference_state
+
+    @inference_state_method_cache(default='')
     def py__doc__(self):
         api_type = self.api_type
         if api_type in ('function', 'class'):

test/examples/import-recursion/cadquery_simple/__init__.py

@@ -0,0 +1 @@
+from .cq import selectors

test/examples/import-recursion/cadquery_simple/cq.py

@@ -0,0 +1 @@
+from . import selectors

test/examples/import-recursion/cq_example.py

@@ -0,0 +1,3 @@
+import cadquery_simple as cq
+
+cq.

test/test_inference/test_imports.py

@@ -468,3 +468,9 @@ def test_relative_import_star(Script):
     script = Script(source, path='export.py')
 
     assert script.complete(3, len("furl.c"))
+
+
+def test_import_recursion(Script):
+    path = get_example_dir('import-recursion', "cq_example.py")
+    for c in Script(path=path).complete(3, 3):
+        c.docstring()