Issue 26460. Add Quick Fix for missing 'Function.call()' implementation.

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index d7935399f8d8b578fbe5b7c35aee4abdc6445850..4ec437f6d526a0f1ff13bfadb28fc697d110c70f 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -2254,6 +2254,22 @@ main() {
 ''');
   }
 
+  test_createMissingMethodCall() async {
+    resolveTestUnit('''
+class C implements Function {
+}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_MISSING_METHOD_CALL,
+        '''
+class C implements Function {
+  call() {
+    // TODO: implement call
+  }
+}
+''');
+  }
+
   test_createMissingOverrides_field_untyped() async {
     resolveTestUnit('''
 class A {