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tcfail198.hs:6:36: error:
Couldn't match expected type ‘a2’ with actual type ‘a1’
because type variable ‘a2’ would escape its scope
This (rigid, skolem) type variable is bound by
an expression type signature: a2
at tcfail198.hs:6:36-41
In the expression: x :: a
In the second argument of ‘(++)’, namely ‘[x :: a]’
Relevant bindings include
xs :: [a1] (bound at tcfail198.hs:6:21)
x :: a1 (bound at tcfail198.hs:6:19)
f3 :: [a1] -> [a1] (bound at tcfail198.hs:6:6)
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