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What's the problem? A string in Haskell is a list of chars[1]. So you can construct a string by consing chars to an empty list. Or is there something else you object to?

[1] Which incidentally is a reason to avoid using it for anything serious. Text is the better representation of text, and ByteString is better for everything else.

In Haskell "a" is the same as ['a']

As is usually the case with interactive tutorials, unexpected behavior shows up before the clarifying example. Later they show the equivalence of strings "a" and list of chars ['a']

Would you accept:

> 'a' : "" => "a"

Because that's what you did.