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<interactive>:4:7: error:
• Couldn't match type ‘m’ with ‘(,) a0’
Expected: (a0, ((), Int))
Actual: m ((), Int)
‘m’ is untouchable
inside the constraints: ()
bound by the inferred type of it :: ((), Int)
at <interactive>:4:1-25
‘m’ is an interactive-debugger skolem
• In the second argument of ‘($)’, namely ‘runStateT _result 0’
In the expression: snd $ runStateT _result 0
In an equation for ‘it’: it = snd $ runStateT _result 0
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