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SimpleFail16.hs:10:12: error:
• Couldn't match expected type: p0 a0
with actual type: F ()
The type variables ‘p0’, ‘a0’ are ambiguous
• In the first argument of ‘foo’, namely ‘(undefined :: F ())’
In the expression: foo (undefined :: F ())
In an equation for ‘bar’: bar = foo (undefined :: F ())
• Relevant bindings include
bar :: p0 a0 (bound at SimpleFail16.hs:10:1)
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