Issue 5240. Using a non-type in a const object expression is an error, not a warning

compiler/java/com/google/dart/compiler/ast/ASTNodes.java

Index: compiler/java/com/google/dart/compiler/ast/ASTNodes.java
diff --git a/compiler/java/com/google/dart/compiler/ast/ASTNodes.java b/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
index 2fbc66036539133fc6882284c6c052aa856dae32..02f43d2eec3cc689ff1f6cc3e95f647043e1684b 100644
--- a/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
+++ b/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
@@ -1362,4 +1362,25 @@ public class ASTNodes {
     return false;
   }
 
+  /**
+   * @return the {@link DartIdentifier} corresponding to the name of constructor.
+   */
+  public static DartIdentifier getConstructorNameNode(DartNewExpression node) {
+    DartNode constructor = node.getConstructor();
+    return getConstructorNameNode(constructor);
+  }
+
+  /**
+   * @return the {@link DartIdentifier} corresponding to the name of constructor.
+   */
+  private static DartIdentifier getConstructorNameNode(DartNode constructor) {
+    if (constructor instanceof DartPropertyAccess) {
+      return ((DartPropertyAccess) constructor).getName();
+    } else if (constructor instanceof DartTypeNode) {
+      return getConstructorNameNode(((DartTypeNode) constructor).getIdentifier());
+    } else {
+      return (DartIdentifier) constructor;
+    }
+  }
+
 }