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diff --git a/antlr-3.4/tool/src/main/java/org/antlr/tool/GrammarInsufficientPredicatesMessage.java b/antlr-3.4/tool/src/main/java/org/antlr/tool/GrammarInsufficientPredicatesMessage.java
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+++ b/antlr-3.4/tool/src/main/java/org/antlr/tool/GrammarInsufficientPredicatesMessage.java
@@ -0,0 +1,89 @@
+/*
+ * [The "BSD license"]
+ *  Copyright (c) 2010 Terence Parr
+ *  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.tool;
+
+import org.antlr.analysis.DFAState;
+import org.antlr.analysis.DecisionProbe;
+import org.antlr.analysis.Label;
+import org.antlr.runtime.Token;
+import org.stringtemplate.v4.ST;
+
+import java.util.*;
+
+public class GrammarInsufficientPredicatesMessage extends Message {
+	public DecisionProbe probe;
+    public Map<Integer, Set<Token>> altToLocations;
+	public DFAState problemState;
+
+	public GrammarInsufficientPredicatesMessage(DecisionProbe probe,
+												DFAState problemState,
+												Map<Integer, Set<Token>> altToLocations)
+	{
+		super(ErrorManager.MSG_INSUFFICIENT_PREDICATES);
+		this.probe = probe;
+		this.problemState = problemState;
+		this.altToLocations = altToLocations;
+	}
+
+	public String toString() {
+		GrammarAST decisionASTNode = probe.dfa.getDecisionASTNode();
+		line = decisionASTNode.getLine();
+		column = decisionASTNode.getCharPositionInLine();
+		String fileName = probe.dfa.nfa.grammar.getFileName();
+		if ( fileName!=null ) {
+			file = fileName;
+		}
+		ST st = getMessageTemplate();
+		// convert to string key to avoid 3.1 ST bug
+		Map<String, Set<Token>> altToLocationsWithStringKey = new LinkedHashMap<String, Set<Token>>();
+		List<Integer> alts = new ArrayList<Integer>();
+		alts.addAll(altToLocations.keySet());
+		Collections.sort(alts);
+		for (Integer altI : alts) {
+			altToLocationsWithStringKey.put(altI.toString(), altToLocations.get(altI));
+			/*
+			List<String> tokens = new ArrayList<String>();
+			for (Token t : altToLocations.get(altI)) {
+				tokens.add(t.toString());
+			}
+			Collections.sort(tokens);
+			System.out.println("tokens=\n"+tokens);
+			*/
+		}
+		st.add("altToLocations", altToLocationsWithStringKey);
+
+		List<Label> sampleInputLabels = problemState.dfa.probe.getSampleNonDeterministicInputSequence(problemState);
+		String input = problemState.dfa.probe.getInputSequenceDisplay(sampleInputLabels);
+		st.add("upon", input);
+
+		st.add("hasPredicateBlockedByAction", problemState.dfa.hasPredicateBlockedByAction);
+
+		return super.toString(st);
+	}
+
+}