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tcfail198.hs:6:36:
Couldn't match expected type ‘a1’ with actual type ‘a’
because type variable ‘a1’ would escape its scope
This (rigid, skolem) type variable is bound by
an expression type signature: a1
at tcfail198.hs:6:36-41
Relevant bindings include
xs :: [a] (bound at tcfail198.hs:6:21)
x :: a (bound at tcfail198.hs:6:19)
f3 :: [a] -> [a] (bound at tcfail198.hs:6:6)
In the expression: x :: a
In the second argument of ‘(++)’, namely ‘[x :: a]’
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