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T5858.hs:11:7: error:
• Ambiguous type variables ‘a0’, ‘a1’ arising from a use of ‘infer’
prevents the constraint ‘(InferOverloaded
([a0], [a1]))’ from being solved.
Probable fix: use a type annotation to specify what ‘a0’, ‘a1’ should be.
These potential instance exist:
instance (t1 ~ String) => InferOverloaded (t1, t1)
-- Defined at T5858.hs:8:10
• In the expression: infer ([], [])
In an equation for ‘foo’: foo = infer ([], [])
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