Issue 8365. Report error when user library imports an internal SDK library.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
index 7fbf1acf6a23f2bd4fdae6d19e54e5174f51faaa..b3d3afffb00d0603c113df3cf5d7cbc05de16438 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/CompileTimeErrorCodeTest.java
@@ -1510,6 +1510,22 @@ public class CompileTimeErrorCodeTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_importInternalLibrary() throws Exception {
+    Source source = addSource(createSource(//
+    "import 'dart:_interceptors';"));
+    resolve(source);
+    assertErrors(CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY);
+    verify(source);
+  }
+
+  public void test_importInternalLibrary_collection() throws Exception {
+    Source source = addSource(createSource(//
+    "import 'dart:_collection-dev';"));
+    resolve(source);
+    assertErrors(CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY);
+    verify(source);
+  }
+
   public void test_importOfNonLibrary() throws Exception {
     Source source = addSource(createSource(//
         "library lib;",