// stackIndex = ++stackDepth
JsBinaryOperation stackIndexOp = new JsBinaryOperation(info,
JsBinaryOperator.ASG, stackIndexRef(info), inc);
// stack[stackIndex = ++stackDepth]
JsArrayAccess access = new JsArrayAccess(info, stackRef, stackIndexOp);
// stack[stackIndex = ++stackDepth] = currentFunction
JsBinaryOperation op = new JsBinaryOperation(info, JsBinaryOperator.ASG,
access, currentFunctionRef);