Start implementing checked mode compile time errors in analyzer.

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

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java
index 63a94cf288588bcfa1d16483d056c3b99b310dff..2d2de16a6aa7a5c979dbf75aa0654b3ea442a0d3 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/StaticWarningCodeTest.java
@@ -1172,6 +1172,17 @@ public class StaticWarningCodeTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_fieldInitializerNotAssignable_const_unchecked() throws Exception {
+    Source source = addSource(createSource(//
+        "class A {",
+        "  final int x;",
+        "  const A() : x = '';",
+        "}"));
+    resolve(source);
+    assertErrors(source, StaticWarningCode.FIELD_INITIALIZER_NOT_ASSIGNABLE);
+    verify(source);
+  }
+
   public void test_fieldInitializingFormalNotAssignable() throws Exception {
     Source source = addSource(createSource(//
         "class A {",