Runtime errors in ray-casting example

[codeworld-feedback]

Program: https://code.world/haskell#PSAP49qms7Ahg4z1gpLm2Jw

Comment:

Runtime error in out-of-the-box ray-casting example

Message:

Error in array index

[szabi]

You can pass through the inner walls and colour blocks. That's fine for this quick example.

However, when you run into the edges of the outer blocks, a runtime index error is raised, and the interaction freezes.