Also issue warnings if setattr is used in a class instead of an error

test/static_analysis/attribute_warnings.py

@@ -3,6 +3,10 @@ Jedi issues warnings for possible errors if ``__getattr__``,
 ``__getattribute__`` or ``setattr`` are used.
 """
 
+# -----------------
+# __getattr*__
+# -----------------
+
 
 class Cls():
     def __getattr__(self, name):
@@ -22,3 +26,21 @@ Inherited().upper
 
 #! 12 warning attribute-error
 Inherited().undefined
+
+# -----------------
+# setattr
+# -----------------
+
+
+class SetattrCls():
+    def __init__(self, dct):
+        # Jedi doesn't even try to understand such code
+        for k, v in dct:
+            setattr(self, k, v)
+
+        self.defined = 3
+
+c = SetattrCls({'a': 'b'})
+c.defined
+#! 2 warning attribute-error
+c.undefined