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T2693.hs:12:15: error:
• Couldn't match expected type ‘(a8, b1)’ with actual type ‘TFn a6’
The type variables ‘b1’, ‘a6’, ‘a8’ are ambiguous
• In the first argument of ‘fst’, namely ‘x’
In the first argument of ‘(+)’, namely ‘fst x’
• Relevant bindings include n :: a8 (bound at T2693.hs:12:7)
T2693.hs:12:23: error:
• Couldn't match expected type ‘(a8, b2)’ with actual type ‘TFn a7’
The type variables ‘b2’, ‘a7’, ‘a8’ are ambiguous
• In the first argument of ‘fst’, namely ‘x’
In the second argument of ‘(+)’, namely ‘fst x’
• Relevant bindings include n :: a8 (bound at T2693.hs:12:7)
T2693.hs:19:15: error:
• Couldn't match expected type ‘(a5, b0)’ with actual type ‘TFn a2’
The type variables ‘b0’, ‘a2’, ‘a5’ are ambiguous
• In the first argument of ‘fst’, namely ‘x’
In the first argument of ‘(+)’, namely ‘fst x’
• Relevant bindings include n :: a5 (bound at T2693.hs:19:7)
T2693.hs:19:23: error:
• Couldn't match expected type ‘(a3, a5)’ with actual type ‘TFn a4’
The type variables ‘a3’, ‘a4’, ‘a5’ are ambiguous
• In the first argument of ‘snd’, namely ‘x’
In the second argument of ‘(+)’, namely ‘snd x’
• Relevant bindings include n :: a5 (bound at T2693.hs:19:7)
T2693.hs:29:20: error:
• Couldn't match type ‘TFn a0’ with ‘PVR a1’
The type variables ‘a0’, ‘a1’ are ambiguous
Expected type: () -> Maybe (PVR a1)
Actual type: () -> Maybe (TFn a0)
• In the first argument of ‘mapM’, namely ‘g’
In a stmt of a 'do' block: pvs <- mapM g undefined
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