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tcfail018.hs:5:10:
No instance for (Num [t0])
arising from the literal `1'
The type variable `t0' is ambiguous
Possible cause: the monomorphism restriction applied to the following:
a :: t0 (bound at tcfail018.hs:5:2)
Probable fix: give these definition(s) an explicit type signature
or use -XNoMonomorphismRestriction
Possible fix: add an instance declaration for (Num [t0])
In the expression: 1
In a pattern binding: (a : []) = 1
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