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T13610.hs:11:15: error:
• Couldn't match a lifted type with an unlifted type
When matching types
a :: *
Weak# () :: UnliftedType
Expected: (# State# RealWorld, a #)
Actual: (# State# RealWorld, Weak# () #)
• In the expression: mkWeakNoFinalizer# double () s
In the first argument of ‘IO’, namely
‘(\ s -> mkWeakNoFinalizer# double () s)’
In a stmt of a 'do' block:
IO (\ s -> mkWeakNoFinalizer# double () s)
• Relevant bindings include main :: IO a (bound at T13610.hs:8:1)
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