Can you please help me understand the error and how to fix it?
comp = \x -> f(g(h(x)))
The error is
"Variable not in scope: f :: t0 -> t2"
for f, g and h, which they are just some functions not otherwise specified.
I suspect you're trying to build a function that composes 3 functions, much like how . composes 2 functions. To do that, you can't just make up names in the body and expect GHC to know what you meant by them. Instead, you need to bring them into scope somehow, like this: comp f g h = \x -> f(g(h(x)))
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