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> :t []
[] :: [a]
λ> :t [x]
[x] :: [Int]
λ> :t []
[] :: [a]
λ> ' ':"abc"
" abc"
λ> :t []
[] :: [a]
λ> :t ""
"" :: [Char]
λ> head []
*** Exception: /home/trifon/fpsandbox/lists.hs:10:1-14: Non-exhaustive patterns in function head

λ> tail []
*** Exception: /home/trifon/fpsandbox/lists.hs:13:1-14: Non-exhaustive patterns in function tail

λ> [1..10]
[1,2,3,4,5,6,7,8,9,10]
λ> null [1..10]
False
λ> length [1..1000]
1000
λ> [1..10]
7[1,2,3,4,5,6,7,8,9,10]
λ> [1..10]
[1,2,3,4,5,6,7,8,9,10]
λ> [1..10]
[1,2,3,4,5,6,7,8,9,10]
λ> enumFromTo 1 10
[1,2,3,4,5,6,7,8,9,10]
λ> enumFromThenTo 1 2 10
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1Interrupted.
λ> enumFromThenTo 1 2 10
[1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2Interrupted.
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> enumFromThenTo 1 2 10
[1,2,3,4,5,6,7,8,9,10]
λ> enumFromThenTo 1 3 10
[1,3,5,7,9]
λ> ['a'..'e']
"abcde"
λ> [1..3] ++ [5..8]
[1,2,3,5,6,7,8]
λ> reverse [1..10]
[10,9,8,7,6,5,4,3,2,1]
λ>