But with b115 I am getting a stack overflow error.  This seems to be
because of problem with synthetic/bridge methods.

    at gnu.expr.FindTailCalls.visitExpression(FindTailCalls.java:22)
    at gnu.expr.ExpExpVisitor.visitExpression(ExpExpVisitor.java:8)
    at gnu.expr.FindTailCalls.visitExpression(FindTailCalls.java:33)
    at gnu.expr.FindTailCalls.visitExpression(FindTailCalls.java:22)

There are 3 classes:

abstract public class ExpVisitor<R,D> {
  protected R visitExpression (Expression exp, D d) { stuff; }
}
Java 6 or Java 7 both generate:
  Method#1 protected visitExpression (Expression,Object)Object [line 27-28]

abstract class ExpExpVisitor<D> extends ExpVisitor<Expression,D> {
}
Java6 generates no methods.
Java7 generates:
  Method#2 protected bridge synthetic visitExpression (Expression,Object)Expression [line 8]
    invokespecial ExpVisitor.visitExpression (Expression,Object)Object
  Method#3 protected bridge synthetic visitExpression (Expression,Object)Object [line 8]
    invokevirtual ExpExpVisitor.visitExpression (Expression,Object)Expression

class FindTails extends ExpExpVisitor<Expression> {
  protected Expression visitExpression (Expression exp, Expression returnContinuation) {
      return super.visitExpression(exp, exp);
  }
}
Java6 or Java7 both generate the natural:
  Method#3 protected visitExpression (Expression,Expression)Expression [line 33]
    invokespecial ExpExpVisitor.visitExpression (Expression,Object)Object
    [In Java6, calls natural method ExpVisitor.visitExpression directly, as intended.]
    [In Java 7, calls method#2 which calls method#5, which calls method#3.  Stack Overflow.]
Java6 or Java 7 both generate this synthetic:
  Method#4 protected bridge synthetic visitExpression (Expression,Object)Object [line 22]
    invokevirtual FindTailCalls.visitExpression(Expression,Expression)Expression
Java7 only generates this synthetic:
  Method#5 protected bridge synthetic visitExpression (Expression,Object)Expression [line 22]
    invokevirtual FindTailCalls.visitExpression (Expression,Expression)Expression

Look at Method#3.  In Java6, calls natural method ExpVisitor.visitExpression directly,
as intended.  In Java 7, method#3 calls method#2 which calls method#5, which calls method#3.
Stack Overflow.

Is this a known problem?  I'm guess one of you two know what changed and when.
Build 107 seems to be OK.