Improve error message for over qualified constructor names.

compiler/javatests/com/google/dart/compiler/parser/ErrorMessageLocationTest.java

Index: compiler/javatests/com/google/dart/compiler/parser/ErrorMessageLocationTest.java
===================================================================
--- compiler/javatests/com/google/dart/compiler/parser/ErrorMessageLocationTest.java	(revision 418)
+++ compiler/javatests/com/google/dart/compiler/parser/ErrorMessageLocationTest.java	(working copy)
@@ -15,14 +15,14 @@
  */
 public class ErrorMessageLocationTest extends TestCase {
   /**
-   * Test that unexpected token highlights the correct location in the file. 
+   * Test that unexpected token highlights the correct location in the file.
    */
   public void testUnexpectedTokenErrorMessage() {
-    String sourceCode = 
+    String sourceCode =
         "// Empty comment\n" +
         "interface foo default Bar {\n" +
         "}";
-        
+
     DartParserRunner runner = DartParserRunner.parse(getName(), sourceCode);
     List<DartCompilationError> actualErrors = runner.getErrors();
 
@@ -35,4 +35,24 @@
     assertEquals(2, actualError.getLineNumber());
     assertEquals(sourceCode.indexOf(errorTokenString), actualError.getStartPosition());
   }
+
+  public void testExpectedLeftParenErrorMessage1() {
+    String sourceCode =
+        "// comment to change the line\n" +
+        "main () {\n" +
+        "  var x = new PART1.PART2.PART3.PART4();\n" +
+        "}\n";
+
+    DartParserRunner runner = DartParserRunner.parse(getName(), sourceCode);
+    List<DartCompilationError> actualErrors = runner.getErrors();
+
+    // Due to error recovery more than a single error is generated
+    DartCompilationError actualError = actualErrors.get(0);
+
+    String errorTokenString = "PART4";
+    assertEquals(33, actualError.getColumnNumber());
+    assertEquals(errorTokenString.length(), actualError.getLength());
+    assertEquals(3, actualError.getLineNumber());
+    assertEquals(sourceCode.indexOf(errorTokenString), actualError.getStartPosition());
+  }
 }