数据构造函数不在 scope - Haskell

Question

I am new to Haskell so I apologise if this is an obvious mistake to some. I have been trying to add a tuple to a list of tuples, however I get an errors like Data constructor not in scope: Adelle:: String and Data constructor not in scope: Hello:: String when I input: addRecord tData Hello Adelle into GHCi.

I have done some research and some people suggested to others that their variables have to be lower case, which mine are. So I am unsure what is causing the issue. Any help is hugely appreciated.

My code is below:

type Sales = (String, String, Int)

tData :: [Sales]
tData = [("No Lie", "Sean Paul feat. Dua Lipa",  100),
         ("Fear & Delight", "The Correspondents",  120)]

addRecord :: [Sales] -> String -> String -> [Sales]
addRecord dataset songName artist = dataset ++ [(songName, artist, 1)]

Answer 1

You need to put double quotes around your strings:

addRecord tData "Hello" "Adelle"