| The error above is telling you that there's no instance for 'MArray b
| FlatVector IO' - this is because you haven't specified the array type
| 'b' into which thaw should convert the array. The error message is a
| bit misleading; it's really an ambiguity rather than a missing
instance
| (I don't know whether it could be reasonably improved, though).
That is indeed horrible. Duly improved.
Foo.hs:16:7:
Ambiguous type variable `b' in the constraint:
`MArray b FlatVector IO' arising from use of `thaw' at
Foo.hs:16:7-10
Probable fix: add a type signature that fixes these type variable(s)
Simon
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