Fix quoting 'type data' declarations
The quote [d|type data T|] was ignoring the type data flag and giving the same result as [d|data T|].
Instead, we now fail, until support for type data in TH is implemented.
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The quote [d|type data T|] was ignoring the type data flag and giving the same result as [d|data T|].
Instead, we now fail, until support for type data in TH is implemented.