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tcfail128.hs:18:16: error: [GHC-39999]
• Ambiguous type variable ‘b0’ arising from a use of ‘thaw’
prevents the constraint ‘(Data.Array.Base.MArray
b0 FlatVector IO)’ from being solved.
Probable fix: use a type annotation to specify what ‘b0’ should be.
one instance involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In a stmt of a 'do' block: v <- thaw tmp
In the expression:
do let sL = ...
dim = length sL
....
v <- thaw tmp
return ()
In an equation for ‘main’:
main
= do let sL = ...
....
v <- thaw tmp
return ()
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