On 2017-03-21 21:34, David Feuer wrote:
This seems much too weird:
*> :set -XDeriveFoldable
*> data Foo a = Foo ((a,a),a) deriving Foldable
*> length ((1,1),1)
1
*> length $ Foo ((1,1),1)
3
This is not unique to tuples, consider:
> :set -XDeriveFoldable
> data Foo a = Foo [[a]] deriving Foldable
> length [[1,2]]
1
> length $ Foo [[1,2]]
2
Twan
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