Start analyzing LibraryUnitTarget(s) from BuildLibraryElementTask.

pkg/analyzer/lib/src/generated/ast.dart

Index: pkg/analyzer/lib/src/generated/ast.dart
diff --git a/pkg/analyzer/lib/src/generated/ast.dart b/pkg/analyzer/lib/src/generated/ast.dart
index 671ac4438d22de084e959c42dbba26bb814f4222..a7dc8e736d2079989b8179446b48adc1eb3af0f1 100644
--- a/pkg/analyzer/lib/src/generated/ast.dart
+++ b/pkg/analyzer/lib/src/generated/ast.dart
@@ -1641,6 +1641,13 @@ class AstCloner implements AstVisitor<AstNode> {
   YieldStatement visitYieldStatement(YieldStatement node) => new YieldStatement(
       cloneToken(node.yieldKeyword), cloneToken(node.star),
       cloneNode(node.expression), cloneToken(node.semicolon));
+
+  /**
+   * Return a clone of the given [node].
+   */
+  static AstNode clone(AstNode node) {
+    return node.accept(new AstCloner());
+  }
 }
 
 /**