Add test + fix for 'raise from function'.

2 files changed, 18 insertions, 0 deletions

diff --git a/pylint/checkers/utils.py b/pylint/checkers/utils.py
index 1aff860e8..9d8a18ba5 100644
--- a/pylint/checkers/utils.py
+++ b/pylint/checkers/utils.py
@@ -467,6 +467,8 @@ def inherit_from_std_ex(node):
     if node.name in ('Exception', 'BaseException') \
             and node.root().name == EXCEPTIONS_MODULE:
         return True
+    if not hasattr(node, 'ancestors'):
+        return False
     return any(inherit_from_std_ex(parent)
                for parent in node.ancestors(recurs=True))
 
diff --git a/pylint/test/unittest_checker_exceptions.py b/pylint/test/unittest_checker_exceptions.py
index a479c683b..39aa2ffda 100644
--- a/pylint/test/unittest_checker_exceptions.py
+++ b/pylint/test/unittest_checker_exceptions.py
@@ -60,3 +60,19 @@ class TestExceptionsChecker(CheckerTestCase):
         message = Message('raising-bad-type', node=nodes[3], args='tuple')
         with self.assertAddsMessages(message):
             self.checker.visit_raise(nodes[3])
+
+    @pytest.mark.skipif(sys.version_info[0] != 3,
+                        reason="The test is valid only on Python 3.")
+    def test_bad_exception_context_function(self):
+        node = astroid.extract_node("""
+        def function():
+            pass
+
+        try:
+            pass
+        except function as exc:
+            raise Exception from exc  #@
+        """)
+        message = Message('bad-exception-context', node=node)
+        with self.assertAddsMessages(message):
+            self.checker.visit_raise(node)