Fix a warning

pkg/analyzer/test/generated/strong_mode_test.dart

Index: pkg/analyzer/test/generated/strong_mode_test.dart
diff --git a/pkg/analyzer/test/generated/strong_mode_test.dart b/pkg/analyzer/test/generated/strong_mode_test.dart
index ca85297eea9779937e3661940d2033c195fdf111..f0b5a308094c54ebe188d39f1edb475c202f87a7 100644
--- a/pkg/analyzer/test/generated/strong_mode_test.dart
+++ b/pkg/analyzer/test/generated/strong_mode_test.dart
@@ -1105,7 +1105,7 @@ void test() {
     Element elementA = AstFinder.getClass(unit, "A").element;
     List<Statement> statements =
         AstFinder.getStatementsInTopLevelFunction(unit, "test");
-    DartType check(int i) {
+    void check(int i) {
       VariableDeclarationStatement stmt = statements[i];
       VariableDeclaration decl = stmt.variables.variables[0];
       Expression init = decl.initializer;