[Haskell-beginners]Re: Noob List Woes

18 Dec 2025

      Thx! I believe that indenting bs just killed my exploration of haskell. Much obliged….

—
Duke
Sent from my iPhone
...
On Dec 18, 2025, at 12:14 AM, Bob Ippolito  wrote:

It looks like the problem is the indentation, I would expect the let and the print statements to have the same level of indentation (since there’s no “in” with the “let”)
...
On Wed, Dec 17, 2025 at 20:44 Duke Normandin  wrote:
Just started learning Haskell!
Currently watching this particular video:
https://youtu.be/vhsONvQc-Dc?list=PLmTgnNwroyn8TnF26YRvW-hvQF1ypztzg
in the seies. I copied his code verbatim, but keep getting errors
running the code on my antiX-23.2 Linux box using a fresh Haskell
install.
[quote]
main = do
  let testScores = [79,85,92,56]
    print (testScores !! 0)  -- !! means index-of
    print (testScores !! 3)  -- last item
    print (head testScores)  -- returns first item in a list
[/quote]
[quote]
runghc "hello.hs" (in
directory: /home/dnormandin/Programming/haskell/code) hello.hs:1:8:
error: [GHC-52095] Unexpected do block in function application:
        do let testScores = ...
    Suggested fixes:
      • Use parentheses.
      • Perhaps you intended to use BlockArguments
        You may enable this language extension in GHCi with:
          :set -XBlockArguments
  |
1 | main = do
  |        ^^...
Compilation failed.
[/quote]
I can't figure out what's wrong with the code. I _think_ that the
indenting is ok - which BTW is a bloody PITA!!
I have some cl/scheme experience, but mostly with procedural langs.
Maybe the tutorial is too dated to be useful? If it is, is there a
similar video tutorial for beginners? TIA ...
-- 
Duke
_______________________________________________
Beginners mailing list -- beginners@haskell.org
To unsubscribe send an email to beginners-leave@haskell.org

Beginners mailing list -- beginners@haskell.org
To unsubscribe send an email to beginners-leave@haskell.org