Issue 5162. Report error when initializing already initialized final field

compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java

Index: compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java
index ee5860a488e46a358165c26c1279417fb4f30f4e..c08537efd47942c06dc294dcf81db3dbd7ca6121 100644
--- a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java
+++ b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerCompilerTest.java
@@ -4920,7 +4920,7 @@ public class TypeAnalyzerCompilerTest extends CompilerTestCase {
         result.getErrors(),
         errEx(ResolverErrorCode.FORMAL_PARAMETER_NAME_EXPECTED, 5, 4, 1));
   }
-  
+
   /**
    * <p>
    * http://code.google.com/p/dart/issues/detail?id=5148
@@ -4937,6 +4937,23 @@ public class TypeAnalyzerCompilerTest extends CompilerTestCase {
         errEx(ResolverErrorCode.STATIC_METHOD_MUST_HAVE_BODY, 3, 3, 13));
   }
 
+  /**
+   * <p>
+   * http://code.google.com/p/dart/issues/detail?id=5162
+   */
+  public void test_initializeFinalInstanceVariable_atDeclaration_inInitializer() throws Exception {
+    AnalyzeLibraryResult result = analyzeLibrary(
+        "// filler filler filler filler filler filler filler filler filler filler",
+        "class A {",
+        "  final f = 0;",
+        "  A() : f = 1 {}",
+        "}",
+        "");
+    assertErrors(
+        result.getErrors(),
+        errEx(ResolverErrorCode.DUPLICATE_INITIALIZATION, 4, 9, 5));
+  }
+
   private <T extends DartNode> T findNode(final Class<T> clazz, String pattern) {
     final int index = testSource.indexOf(pattern);
     assertTrue(index != -1);