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T13780a.hs:9:40: error: [GHC-88634]
• Data constructor ‘MkFoo’ cannot be used here
(it has an unpromotable context ‘a ~ Bool’)
• In the second argument of ‘(~)’, namely ‘MkFoo’
In the definition of data constructor ‘SMkFoo’
In the data instance declaration for ‘Sing’
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