Hello, Haskell!
If I break, you can:
  1. Restart:           M-x haskell-process-restart
  2. Configure logging: C-h v haskell-process-log (useful for debugging)
  3. General config:    M-x customize-mode
  4. Hide these tips:   C-h v haskell-process-show-debug-tips
λ> f
Interrupted.
λ> l = (f:[])
λ> l = (:) f []
λ> tail l
[]
λ> head l
Interrupted.
λ> g f
Interrupted.
λ> h f 5
6
λ> length [f, f, f, f, f]
5
λ> l [f, f, f, f, f]
5
λ> g' f
Interrupted.
λ>