[Haskell-cafe] A possibly stupid doubt about the GHC's overlapping instances flag's

[Rodrigo Geraldo]

Hi!

Suppose that the GHC's flag -fallow-incoherent-instances is enabled. In this
situation, when a instance will be rejected?
And if the flag -fallow-overlapping-instances is enabled. When a instance
will be rejected?

Thanks!

Rodrigo
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