One example given in this discussion is: clunky env var1 var1 = case lookup env var1 of Nothing -> fail Just val1 -> case lookup env var2 of Nothing -> fail Just val2 -> val1 + val2 where fail = val1 + val2
this needs to be fixed to: clunky env var1 var1 = case lookup env var1 of Nothing -> fail Just val1 -> case lookup env var2 of Nothing -> fail Just val2 -> val1 + val2 where fail = var1 + var2 <<<< (Added for emphasis) I didn't see it myself on the first readthrough, but I was comparing structure between two examples and noticed the discrepency. Let's fix it for correctness' sake.
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