src/third_party/mozjs-45/js/src/jit-test/tests/jaeger/fused-eq-ifeq.js

function ack(m,n){
   if (m==0) { return n+1; }
   if (n==0) { return ack(m-1,1); }
   return ack(m-1, ack(m,n-1) );
}
assertEq(ack(3, 3), 61);