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RepPolyMcGuard.hs:30:16: error: [GHC-55287]
• The first argument of the rebindable syntax operator ‘guard’
arising from a statement in a monad comprehension
does not have a fixed runtime representation.
Its type is:
a0 :: TYPE c0
Cannot unify ‘rep’ with the type variable ‘c0’
because it is not a concrete ‘RuntimeRep’.
• In a stmt of a monad comprehension: undefined
In the expression: [() | undefined]
In an equation for ‘foo’: foo _ = [() | undefined]
• Relevant bindings include
foo :: () -> ma (bound at RepPolyMcGuard.hs:30:1)
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