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T15325.hs:11:7: warning: [-Wdeferred-type-errors (in -Wdefault)]
• No instance for (PolyList e0) arising from a use of ‘f’
• In the expression: f 0
In an equation for ‘plh’: plh = f 0
T15325.hs:11:9: warning: [-Wdeferred-type-errors (in -Wdefault)]
• Ambiguous type variable ‘e0’ arising from the literal ‘0’
prevents the constraint ‘(Num e0)’ from being solved.
Probable fix: use a type annotation to specify what ‘e0’ should be.
Potentially matching instances:
instance Num Integer -- Defined in ‘GHC.Num’
instance Num Double -- Defined in ‘GHC.Float’
...plus three others
...plus one instance involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the first argument of ‘f’, namely ‘0’
In the expression: f 0
In an equation for ‘plh’: plh = f 0
*** Exception: T15325.hs:11:7: error:
• No instance for (PolyList e0) arising from a use of ‘f’
• In the expression: f 0
In an equation for ‘plh’: plh = f 0
(deferred type error)
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