Don't collect names in parameter default and annotation for visited function (PY-19599)

Because they are collected in the outer scope and outer scope is considered as their owner in ScopeUtil.getScopeOwner.

python/src/com/jetbrains/python/codeInsight/dataflow/scope/impl/ScopeImpl.java

@@ -236,6 +236,11 @@ public class ScopeImpl implements Scope {
         super.visitPyFunction(node);
       }
 
+      @Override
+      public void visitPyNamedParameter(PyNamedParameter node) {
+        processNamedElement(node);
+      }
+
       @Override
       public void visitPyClass(PyClass node) {
         visitDecorators(node.getDecoratorList());
@@ -249,11 +254,7 @@ public class ScopeImpl implements Scope {
       @Override
       public void visitPyElement(PyElement node) {
         if (node instanceof PsiNamedElement && !(node instanceof PyKeywordArgument)) {
-          final String name = node.getName();
-          if (!namedElements.containsKey(name)) {
-            namedElements.put(name, Sets.newLinkedHashSet());
-          }
-          namedElements.get(name).add((PsiNamedElement)node);
+          processNamedElement((PsiNamedElement)node);
         }
         if (node instanceof PyImportedNameDefiner) {
           importedNameDefiners.add((PyImportedNameDefiner)node);
@@ -274,6 +275,10 @@ public class ScopeImpl implements Scope {
           }
         }
       }
+
+      private void processNamedElement(@NotNull PsiNamedElement element) {
+        namedElements.computeIfAbsent(element.getName(), __ -> Sets.newLinkedHashSet()).add(element);
+      }
     });
 
     myNamedElements = namedElements;

python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java

@@ -714,6 +714,13 @@ public class PyUnresolvedReferencesInspectionTest extends PyInspectionTestCase {
                  "        self.value = self.datetime(2016, 1, 1)");
   }
 
+  // PY-19599
+  public void testDefinedInParameterDefaultAndBody() {
+    doTestByText("def f(p=(x for x in [])):\n" +
+                 "    x = 1\n" +
+                 "    return x");
+  }
+
   @NotNull
   @Override
   protected Class<? extends PyInspection> getInspectionClass() {