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

Index: pkg/analyzer/test/src/task/strong_mode_test.dart
diff --git a/pkg/analyzer/test/src/task/strong_mode_test.dart b/pkg/analyzer/test/src/task/strong_mode_test.dart
index 097d5d433335fd547f7b22dfc413d5e09616e242..b7b86e3983ccce4a2f442d588836c9b3acb74561 100644
--- a/pkg/analyzer/test/src/task/strong_mode_test.dart
+++ b/pkg/analyzer/test/src/task/strong_mode_test.dart
@@ -18,6 +18,7 @@ import '../context/abstract_context.dart';
 main() {
   initializeTestEnvironment();
   runReflectiveTests(InstanceMemberInferrerTest);
+  runReflectiveTests(SetFieldTypeTest);
   runReflectiveTests(VariableGathererTest);
 }
 
@@ -982,6 +983,23 @@ class B extends A {
 }
 
 @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;