Fix a crash which occurred when inferring unary operands which yielded objects which weren't callable.

2 files changed, 10 insertions, 0 deletions

diff --git a/astroid/inference.py b/astroid/inference.py
index 3f7ab5c..f7ab2be 100644
--- a/astroid/inference.py
+++ b/astroid/inference.py
@@ -373,6 +373,8 @@ def _infer_unaryop(self, context=None):
                 try:
                     meth = operand.getattr(meth, context=context)[0]
                     inferred = next(meth.infer(context=context))
+                    if inferred is util.YES or not inferred.callable():
+                        continue
                     call_results = inferred.infer_call_result(self, context=context)
                     result = next(call_results, None)
                     if result is None:
diff --git a/astroid/tests/unittest_inference.py b/astroid/tests/unittest_inference.py
index 841d9ff..fbd97e2 100644
--- a/astroid/tests/unittest_inference.py
+++ b/astroid/tests/unittest_inference.py
@@ -2016,6 +2016,14 @@ class InferenceTest(resources.SysPathSetup, unittest.TestCase):
             inferred = next(bad_node.infer())
             self.assertEqual(inferred, util.YES)
 
+    def test_unary_op_instance_method_not_callable(self):
+        ast_node = test_utils.extract_node('''
+        class A:
+            __pos__ = (i for i in range(10))
+        +A() #@
+        ''')
+        self.assertRaises(InferenceError, next, ast_node.infer())
+
     def test_binary_op_type_errors(self):
         ast_nodes = test_utils.extract_node('''
         import collections