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T20122.hs:11:7: error:
• Ambiguous type variable ‘a0’ arising from a use of ‘test’
prevents the constraint ‘(Testable a0)’ from being solved.
Relevant bindings include
foo :: a0 -> Bool (bound at T20122.hs:11:1)
Probable fix: use a type annotation to specify what ‘a0’ should be.
Potentially matching instance:
instance Testable A -- Defined at T20122.hs:8:10
• In the expression: test
In an equation for ‘foo’: foo = test
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