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T7857.hs:8:11: error: [GHC-39999]
• Could not deduce ‘PrintfType a0’ arising from a use of ‘printf’
from the context: PrintfArg t
bound by the inferred type of g :: PrintfArg t => t -> b
at T7857.hs:8:1-21
The type variable ‘a0’ is ambiguous
Potentially matching instances:
instance [safe] (a ~ ()) => PrintfType (IO a)
-- Defined in ‘Text.Printf’
instance [safe] (PrintfArg a, PrintfType r) => PrintfType (a -> r)
-- Defined in ‘Text.Printf’
...plus one other
(use -fprint-potential-instances to see them all)
• In the second argument of ‘($)’, namely ‘printf "" i’
In the expression: f $ printf "" i
In an equation for ‘g’: g i = f $ printf "" i
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