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T12151.hs:9:13: error: [GHC-72771]
• The default type signature for put: forall t. t
does not match its corresponding non-default type signature
• When checking the class method: put :: forall a. Put a => a
In the class declaration for ‘Put’
T12151.hs:9:13: error: [GHC-39999]
• Could not deduce ‘Put a0’
from the context: Put a
bound by the type signature for:
put :: forall a t. Put a => t
at T12151.hs:9:13-15
The type variable ‘a0’ is ambiguous
• In the ambiguity check for ‘put’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
When checking the class method: put :: forall a. Put a => a
In the class declaration for ‘Put’
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