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diff --git a/tool/src/org/antlr/v4/codegen/model/LL1Loop.java b/tool/src/org/antlr/v4/codegen/model/LL1Loop.java
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+++ b/tool/src/org/antlr/v4/codegen/model/LL1Loop.java
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+/*
+ * [The "BSD license"]
+ *  Copyright (c) 2012 Terence Parr
+ *  Copyright (c) 2012 Sam Harwell
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.antlr.v4.codegen.model;
+
+import org.antlr.v4.codegen.OutputModelFactory;
+import org.antlr.v4.runtime.misc.IntervalSet;
+import org.antlr.v4.tool.ast.GrammarAST;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/** */
+public abstract class LL1Loop extends Choice {
+	/** The state associated wih the (A|B|...) block not loopback, which
+	 *  is super.stateNumber
+	 */
+	public int blockStartStateNumber;
+	public int loopBackStateNumber;
+
+	@ModelElement public OutputModelObject loopExpr;
+	@ModelElement public List<SrcOp> iteration;
+
+	public LL1Loop(OutputModelFactory factory,
+				   GrammarAST blkAST,
+				   List<CodeBlockForAlt> alts)
+	{
+		super(factory, blkAST, alts);
+	}
+
+	public void addIterationOp(SrcOp op) {
+		if ( iteration==null ) iteration = new ArrayList<SrcOp>();
+		iteration.add(op);
+	}
+
+	public SrcOp addCodeForLoopLookaheadTempVar(IntervalSet look) {
+		TestSetInline expr = addCodeForLookaheadTempVar(look);
+		if (expr != null) {
+			CaptureNextTokenType nextType = new CaptureNextTokenType(factory, expr.varName);
+			addIterationOp(nextType);
+		}
+		return expr;
+	}
+}