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<interactive>:4:1: error:
• No instance for (Show a2) arising from a use of ‘print’
Cannot resolve unknown runtime type ‘a2’
Use :print or :force to determine these types
Relevant bindings include it :: a2 (bound at <interactive>:4:1)
These potential instances exist:
instance (Show a, Show b) => Show (Either a b)
-- Defined in ‘Data.Either’
instance Show Ordering -- Defined in ‘GHC.Show’
instance Show Integer -- Defined in ‘GHC.Show’
...plus 23 others
...plus 19 instance involving out-of-scope typess
(use -fprint-potential-instances to see them all)
• In a stmt of an interactive GHCi command: print it
<interactive>:6:1: error:
• No instance for (Show a2) arising from a use of ‘print’
Cannot resolve unknown runtime type ‘a2’
Use :print or :force to determine these types
Relevant bindings include it :: a2 (bound at <interactive>:6:1)
These potential instances exist:
instance (Show a, Show b) => Show (Either a b)
-- Defined in ‘Data.Either’
instance Show Ordering -- Defined in ‘GHC.Show’
instance Show Integer -- Defined in ‘GHC.Show’
...plus 23 others
...plus 19 instance involving out-of-scope typess
(use -fprint-potential-instances to see them all)
• In a stmt of an interactive GHCi command: print it
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