Fix "uninitialized constant UserCode::Infinity (NameError)" exception message so it's "uninitialized constant Infinity (NameError)" instead.
Fix "uninitialized constant UserCode::Infinity (NameError)" exception message so it's "uninitialized constant Infinity (NameError)" instead.

danielstutzman/online-ruby-tutor,danielstutzman/online-ruby-tutor,danielstutzman/online-ruby-tutor