Fix NPE in ErrorReporter (issue 22980)

pkg/analyzer/test/generated/all_the_rest_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.all_the_rest_test;
 
 import 'dart:collection';
@@ skipping 108 matching lines @@
       "html",
       ht.TokenType.GT
     ]);
   }
 
   void test_tokenize_directive_incomplete() {
     _tokenize2("<? \nfoo", <Object>["<? \nfoo"], <int>[0, 4]);
   }
 
   void test_tokenize_directive_xml() {
-    _tokenize("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>", <Object>[
-      "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"
-    ]);
+    _tokenize("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>",
+        <Object>["<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"]);
   }
 
   void test_tokenize_directives_incomplete_with_newline() {
     _tokenize2("<! \nfoo", <Object>["<! \nfoo"], <int>[0, 4]);
   }
 
   void test_tokenize_empty() {
     _tokenize("", <Object>[]);
   }
 
@@ skipping 5557 matching lines @@
     expect(typeParameters, hasLength(0));
   }
 
   void test_visitTypeAlias_withTypeParameters() {
     ElementHolder holder = new ElementHolder();
     ElementBuilder builder = new ElementBuilder(holder);
     String aliasName = "F";
     String firstTypeParameterName = "A";
     String secondTypeParameterName = "B";
     TypeAlias typeAlias = AstFactory.typeAlias(null, aliasName, AstFactory
-        .typeParameterList([
-      firstTypeParameterName,
-      secondTypeParameterName
-    ]), AstFactory.formalParameterList());
+            .typeParameterList(
+                [firstTypeParameterName, secondTypeParameterName]),
+        AstFactory.formalParameterList());
     typeAlias.accept(builder);
     List<FunctionTypeAliasElement> aliases = holder.typeAliases;
     expect(aliases, hasLength(1));
     FunctionTypeAliasElement alias = aliases[0];
     expect(alias, isNotNull);
     expect(alias.name, aliasName);
     expect(alias.type, isNotNull);
     expect(alias.isSynthetic, isFalse);
     List<VariableElement> parameters = alias.parameters;
     expect(parameters, isNotNull);
@@ skipping 691 matching lines @@
     unit.types = <ClassElement>[element];
     return element.type;
   }
 
   void test_creation() {
     GatheringErrorListener listener = new GatheringErrorListener();
     TestSource source = new TestSource();
     expect(new ErrorReporter(listener, source), isNotNull);
   }
 
+  void test_reportErrorForElement_named() {
+    DartType type = createType("/test1.dart", "A");
+    ClassElement element = type.element;
+    GatheringErrorListener listener = new GatheringErrorListener();
+    ErrorReporter reporter = new ErrorReporter(listener, element.source);
+    reporter.reportErrorForElement(
+        StaticWarningCode.CONFLICTING_INSTANCE_GETTER_AND_SUPERCLASS_MEMBER,
+        element, ['A']);
+    AnalysisError error = listener.errors[0];
+    expect(error.offset, element.nameOffset);
+  }
+
+  void test_reportErrorForElement_unnamed() {
+    ImportElementImpl element =
+        ElementFactory.importFor(ElementFactory.library(null, ''), null);
+    GatheringErrorListener listener = new GatheringErrorListener();
+    ErrorReporter reporter = new ErrorReporter(
+        listener, new NonExistingSource("/test.dart", UriKind.FILE_URI));
+    reporter.reportErrorForElement(
+        StaticWarningCode.CONFLICTING_INSTANCE_GETTER_AND_SUPERCLASS_MEMBER,
+        element, ['A']);
+    AnalysisError error = listener.errors[0];
+    expect(error.offset, element.nameOffset);
+  }
+
   void test_reportTypeErrorForNode_differentNames() {
     DartType firstType = createType("/test1.dart", "A");
     DartType secondType = createType("/test2.dart", "B");
     GatheringErrorListener listener = new GatheringErrorListener();
     ErrorReporter reporter =
         new ErrorReporter(listener, firstType.element.source);
     reporter.reportTypeErrorForNode(
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE,
         AstFactory.identifier3("x"), [firstType, secondType]);
     AnalysisError error = listener.errors[0];
@@ skipping 953 matching lines @@
     ht.HtmlUnit htmlUnit = parse("""
 <html>
   <body>
     <script type='application/dart'>
 $scriptBody
     </script>
   </body>
 </html>""");
     _validate(htmlUnit, [
       _t4("html", [
-        _t4("body", [
-          _t("script", _a(["type", "'application/dart'"]), scriptBody)
-        ])
+        _t4("body",
+            [_t("script", _a(["type", "'application/dart'"]), scriptBody)])
       ])
     ]);
   }
   ht.HtmlUnit parse(String contents) {
 //    TestSource source =
 //        new TestSource.con1(FileUtilities2.createFile("/test.dart"), contents);
     ht.AbstractScanner scanner = new ht.StringScanner(null, contents);
     scanner.passThroughElements = <String>[_TAG_SCRIPT];
     ht.Token token = scanner.tokenize();
     LineInfo lineInfo = new LineInfo(scanner.lineStarts);
@@ skipping 47 matching lines @@
   }
   void test_parse_comment_in_content() {
     ht.HtmlUnit htmlUnit = parse("<html><!-- comment --></html>");
     _validate(htmlUnit, [_t3("html", "<!-- comment -->")]);
   }
   void test_parse_content() {
     ht.HtmlUnit htmlUnit = parse("<html>\n<p a=\"b\">blat \n </p>\n</html>");
     // ht.XmlTagNode.getContent() does not include whitespace
     // between '<' and '>' at this time
     _validate(htmlUnit, [
-      _t3("html", "\n<pa=\"b\">blat \n </p>\n", [
-        _t("p", _a(["a", "\"b\""]), "blat \n ")
-      ])
+      _t3("html", "\n<pa=\"b\">blat \n </p>\n",
+          [_t("p", _a(["a", "\"b\""]), "blat \n ")])
     ]);
   }
   void test_parse_content_none() {
     ht.HtmlUnit htmlUnit = parse("<html><p/>blat<p/></html>");
     _validate(
         htmlUnit, [_t3("html", "<p/>blat<p/>", [_t3("p", ""), _t3("p", "")])]);
   }
   void test_parse_declaration() {
     ht.HtmlUnit htmlUnit = parse("<!DOCTYPE html>\n\n<html><p></p></html>");
     _validate(htmlUnit, [_t4("html", [_t3("p", "")])]);
@@ skipping 1098 matching lines @@
     if (_expectedExternalScriptName == null) {
       expect(scriptSource, isNull, reason: "script $scriptIndex");
     } else {
       expect(scriptSource, isNotNull, reason: "script $scriptIndex");
       String actualExternalScriptName = scriptSource.shortName;
       expect(actualExternalScriptName, _expectedExternalScriptName,
           reason: "script $scriptIndex");
     }
   }
 }