#PY-16228 fixed Enable PyArgumentEqualDefaultInspection for decorators

python/src/com/jetbrains/python/inspections/PyArgumentEqualDefaultInspection.java

@@ -80,6 +80,18 @@ public class PyArgumentEqualDefaultInspection extends PyInspection {
       checkArguments(node, node.getArguments());
     }
 
+    @Override
+    public void visitPyDecoratorList(final PyDecoratorList node) {
+      PyDecorator[] decorators = node.getDecorators();
+
+      for (PyDecorator decorator: decorators) {
+        if (decorator.hasArgumentList()) {
+          PyExpression[] arguments = decorator.getArguments();
+          checkArguments(decorator, arguments);
+        }
+      }
+    }
+
     private static boolean hasSpecialCasedDefaults(PyCallable callable, PsiElement anchor) {
       final String name = callable.getName();
       final PyBuiltinCache cache = PyBuiltinCache.getInstance(anchor);

python/testData/inspections/PyArgumentEqualDefaultInspection/test.py

@@ -78,4 +78,11 @@ def f1(value=-1):
     print(value)
 
 def f2():
-    f1(value =-2)
+    f1(value =-2)
+
+def decorator(arg='baz'):
+    return lambda x: x
+
+@decorator(<weak_warning descr="Argument equals to default parameter value">arg='baz'</weak_warning>)
+def f<error descr="'(' expected">:</error>
+  pass