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T16628.hs:10:5: error:
• No instance for ‘MonadFail Identity’
arising from a do statement
with the failable pattern ‘[x]’
• In a stmt of a 'do' block: [x] <- i1
In the expression:
do _ <- i0
[x] <- i1
pure (x + 42)
In an equation for ‘f’:
f i0 i1
= do _ <- i0
[x] <- i1
pure (x + 42)
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