Issue 26147. Don't attempt to set the type of the parameter for setters without parameters.

pkg/analyzer/test/src/task/strong_mode_test.dart

 // Copyright (c) 2015, 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.
 
 library analyzer.test.src.task.strong_mode_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/strong_mode.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import '../../utils.dart';
 import '../context/abstract_context.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(InstanceMemberInferrerTest);
+  runReflectiveTests(SetFieldTypeTest);
   runReflectiveTests(VariableGathererTest);
 }
 
 @reflectiveTest
 class InstanceMemberInferrerTest extends AbstractContextTest {
   InstanceMemberInferrer get createInferrer =>
       new InstanceMemberInferrer(context.typeProvider,
           typeSystem: context.typeSystem);
 
   /**
@@ skipping 944 matching lines @@
     // are treated as independent methods.
     expect(setterB.parameters[0].type, setterA.parameters[0].type);
 
     // Note that B's synthetic field type will be String. This matches what
     // resolver would do if we explicitly typed the parameter as 'String'
     expect(fieldB.type, setterB.parameters[0].type);
   }
 }
 
 @reflectiveTest
+class SetFieldTypeTest extends AbstractContextTest {
+  void test_setter_withoutParameter() {
+    CompilationUnitElement unit = _resolve('''
+var x = 0;
+set x() {}
+''');
+    TopLevelVariableElement variable = unit.topLevelVariables.single;
+    setFieldType(variable, context.typeProvider.intType);
+  }
+
+  CompilationUnitElement _resolve(String content) {
+    Source source = addSource('/test.dart', content);
+    return context.resolveCompilationUnit2(source, source).element;
+  }
+}
+
+@reflectiveTest
 class VariableGathererTest extends AbstractContextTest {
   void test_creation_withFilter() {
     VariableFilter filter = (variable) => true;
     VariableGatherer gatherer = new VariableGatherer(filter);
     expect(gatherer, isNotNull);
     expect(gatherer.filter, filter);
   }
 
   void test_creation_withoutFilter() {
     VariableGatherer gatherer = new VariableGatherer();
@@ skipping 47 matching lines @@
     }
   }
 }
 ''');
     CompilationUnit unit = context.resolveCompilationUnit2(source, source);
     VariableGatherer gatherer = new VariableGatherer(filter);
     unit.accept(gatherer);
     return gatherer.results;
   }
 }