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tcfail125.hs:1:14: warning: [-Wdeprecated-flags (in -Wdefault)]
-XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.
tcfail125.hs:11:4: error: [GHC-39999]
• No instance for ‘Show a’ arising from a use of ‘LiftObs’
Possible fix:
add (Show a) to the context of
the type signature for:
f :: forall a. Obs a -> String
• In the pattern: LiftObs _ _
In an equation for ‘f’: f (LiftObs _ _) = "yes"
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