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• Ambiguous type variables ‘_0’, ‘_1’ arising from a use of ‘z’
prevents the constraint ‘(MArray
(STUArray _0) Bool (ST _1))’ from being solved.
Relevant bindings include
j :: ST _1 Bool (bound at src/Asd.hs:13:1)
Probable fix: use a type annotation to specify what ‘_0’,
‘_1’ should be.
These potential instance exist:
instance MArray (STUArray s) Bool (ST s)
-- Defined in ‘Data.Array.Base’
• In the expression: z @(ST _s) @(STUArray _s) @Int @Bool
In an equation for ‘j’: j = z @(ST _s) @(STUArray _s) @Int @Bool
|
13 | j = z @(ST _s) @(STUArray _s) @Int @Bool
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^к
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