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tcfail142.hs:21:12:
No instance for (Bar a0 r0)
arising from a use of `bar'
The type variables `a0', `r0' are ambiguous
Possible fix: add a type signature that fixes these type variable(s)
In the first argument of `foo', namely `bar'
In the expression: foo bar
In an equation for `test': test = foo bar
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