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Simon Peyton Jones authored
I'd been too ambitious with error handling for 'deriving', and got it entirely wrong. This fixes it. See extensive Note [Exotic derived instance contexts] in TcSimplify. (Most of the extra lines are comments!)
f6a741fa
I'd been too ambitious with error handling for 'deriving', and got it entirely wrong. This fixes it. See extensive Note [Exotic derived instance contexts] in TcSimplify. (Most of the extra lines are comments!)