This issue was originally filed by guilhermeorti...@gmail.com

What steps will reproduce the problem?

1. At dartland.org, choose the example Fibonacci.
2. Instead of 20, as a parameter for the function Fib, use 50.

What is the expected output? What do you see instead?
I was expecting a numeric output generated by the function. Instead, the page freezes or crashes.

What version of the product are you using? On what operating system?
n/a. Google Chrome on Windows 7

Please provide any additional information below.