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RepPolyMcGuard.hs:30:16: error:
• • The first argument to (>>),
arising from the monad comprehension,
does not have a fixed runtime representation:
ma0 :: TYPE rep
• The argument to ‘guard’,
arising from the monad comprehension,
does not have a fixed runtime representation:
a0 :: TYPE rep
• In a stmt of a monad comprehension: undefined
In the expression: [() | undefined]
In an equation for ‘foo’: foo _ = [() | undefined]
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