Explicitly compute analysis results for sources to check errors.

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index 0b00bbfb9087037698379c6115fcf129a3351148..922d984300f2add88c8438fff7f61e4bba6c90c9 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -787,7 +787,8 @@ core.int value;''');
   Future<CompilationUnit> _resolveContents(String code) async {
     Source source = addSource(code);
     LibraryElement library = resolve2(source);
-    await assertNoErrors(source);
+    await computeAnalysisResult(source);
+    assertNoErrors(source);
     verify([source]);
     return analysisContext.resolveCompilationUnit(source, library);
   }