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T9576.exe: T9576.hs:6:31: error: [GHC-39999]
• No instance for ‘Show Foo’ arising from a use of ‘showsPrec’
• In the second argument of ‘(.)’, namely ‘(showsPrec 11 b1)’
In the second argument of ‘showParen’, namely
‘((.) (showString "MkBar ") (showsPrec 11 b1))’
In the expression:
showParen (a >= 11) ((.) (showString "MkBar ") (showsPrec 11 b1))
When typechecking the code for ‘showsPrec’
in a derived instance for ‘Show Bar’:
To see the code I am typechecking, use -ddump-deriv
(deferred type error)
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