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T5689.hs:10:36: error:
• Couldn't match expected type ‘Bool’ with actual type ‘t’
• In the expression: v
In the expression: if v then False else True
In the second argument of ‘writeIORef’, namely
‘(\ v -> if v then False else True)’
• Relevant bindings include
v :: t (bound at T5689.hs:10:28)
r :: IORef (t -> t) (bound at T5689.hs:7:14)
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