[Haskell] Recursive definition of fibonacci with Data.Vector

[Edgar Z. Alvarenga]

Hello,

why I can't define a recursive vector using Data.Vector, like in
the example:

import qualified Data.Vector as V

let fib = 0 `V.cons` (1 `V.cons` V.zipWith (+) fib (V.tail v))

Cheers,
Edgar
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