PY-21906 Fixed: Code inspection stops working with StackOverflowError in PassExecutorService

Don't resolve qualified references in PyResolveUtil.resolveLocally.

python/src/com/jetbrains/python/psi/resolve/PyResolveUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2016 JetBrains s.r.o.
+ * Copyright 2000-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -108,7 +108,7 @@ public class PyResolveUtil {
   public static Collection<PsiElement> resolveLocally(@NotNull PyReferenceExpression referenceExpression) {
     final String referenceName = referenceExpression.getName();
 
-    if (referenceName == null) {
+    if (referenceName == null || referenceExpression.isQualified()) {
       return Collections.emptyList();
     }
 

python/testSrc/com/jetbrains/python/PyTypeTest.java

@@ -1703,6 +1703,17 @@ public class PyTypeTest extends PyTestCase {
            "expr = min(l)");
   }
 
+  // PY-21906
+  public void testSOFOnTransitiveNamedTupleFields() {
+    final PyExpression expression = parseExpr("from collections import namedtuple\n" +
+                                              "class C:\n" +
+                                              "    FIELDS = ('a', 'b')\n" +
+                                              "FIELDS = C.FIELDS\n" +
+                                              "expr = namedtuple('Tup', FIELDS)");
+
+    getTypeEvalContexts(expression).forEach(context -> context.getType(expression));
+  }
+
   private static List<TypeEvalContext> getTypeEvalContexts(@NotNull PyExpression element) {
     return ImmutableList.of(TypeEvalContext.codeAnalysis(element.getProject(), element.getContainingFile()).withTracing(),
                             TypeEvalContext.userInitiated(element.getProject(), element.getContainingFile()).withTracing());