> My goal was to write a type level projection function - but looks like I
> can't do it for this reason.

Is this not what you want?

con fst = K1 ==> K2 ==> fn t :: (K1 * K2) => t.1
con snd = K1 ==> K2 ==> fn t :: (K1 * K2) => t.2

- Gergely

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