Fix type error in analyzer test

pkg/analyzer/test/src/dart/analysis/file_state_test.dart

Index: pkg/analyzer/test/src/dart/analysis/file_state_test.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/file_state_test.dart b/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
index f492fd6a21cca9c3c6afd0acbfe327eac0e36a19..752ee70e34c9c9e04ac09dd9ab68d30a5ccbc0b3 100644
--- a/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
+++ b/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
@@ -689,7 +689,7 @@ set _V3(_) {}
   }
 
   List<T> _excludeSdk<T>(Iterable<T> files) {
-    return files.where((T file) {
+    return files.where((Object file) {

[Leaf, 2017/01/25 19:03:00]

Is this non-strong mode analysis?  This should work in strong mode.

[scheglov, 2017/01/25 19:06:02]

FWIW, resolution works, so "file.uri" is resolved.
But Analysis Server says that the static type of "file" is "T", and code
completion does not work.

       if (file is FileState) {
         return file.uri.scheme != 'dart';
       } else {