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T3406.hs:11:6:
The type variables `a, b'
should be bound by the pattern signature `ItemColID a b'
but are actually discarded by a type synonym
To fix this, expand the type synonym
[Note: I hope to lift this restriction in due course]
In the pattern: x :: ItemColID a b
In an equation for `get':
get (x :: ItemColID a b) = x :: ItemColID a b
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