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Prelude> :{
Prelude| let abs x
Prelude| | x < 0 = 0 - x
Prelude| | otherwise = x
Prelude| :}
<interactive>:59:5: parse error (possibly incorrect indentation)
@glguy
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glguy commented Feb 5, 2013 

Prelude> :{
Prelude| let abs x
Prelude|      | x < 0 = 0 - x 
Prelude|      | otherwise = x
Prelude| :}
Prelude> abs 10
10

@maximveksler
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Prelude> :{
Prelude| let abs x
Prelude|      | otherwise = x
Prelude|      | x < 0 = 0 - x
Prelude| :}

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