fixes #27586, prefer context type in generic inference

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 73561292fb44a59a8034b19f13b18e3329304b0e..ae60924c2afed7a8c46ffa7ca754f581a796dd93 100644
--- a/pkg/analyzer/test/generated/strong_mode_test.dart
+++ b/pkg/analyzer/test/generated/strong_mode_test.dart
@@ -1450,11 +1450,28 @@ class D<S> {
   }
 
   test_genericFunction_upwardsAndDownwards() async {
-    // Regression tests for https://github.com/dart-lang/sdk/issues/27151.
+    // Regression tests for https://github.com/dart-lang/sdk/issues/27586.
     await resolveTestUnit(r'List<num> x = [1, 2];');
-    expectInitializerType('x', 'List<int>');
+    expectInitializerType('x', 'List<num>');
   }
 
+  test_genericFunction_upwardsAndDownwards_Object() async {
+    // Regression tests for https://github.com/dart-lang/sdk/issues/27625.
+    await resolveTestUnit(r'''
+List<Object> aaa = [];
+List<Object> bbb = [1, 2, 3];
+List<Object> ccc = [null];
+List<Object> ddd = [1 as dynamic];
+List<Object> eee = [new Object()];
+    ''');
+    expectInitializerType('aaa', 'List<Object>');
+    expectInitializerType('bbb', 'List<Object>');
+    expectInitializerType('ccc', 'List<Object>');
+    expectInitializerType('ddd', 'List<Object>');
+    expectInitializerType('eee', 'List<Object>');
+  }
+
+
   test_genericMethod() async {
     await resolveTestUnit(r'''
 class C<E> {