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RepPolyArgument.hs:10:18: error: [GHC-55287]
• The argument ‘(undefined @(R @RuntimeRep))’ of ‘undefined’
does not have a fixed runtime representation.
Its type is:
t0 :: TYPE c0
Cannot unify ‘R’ with the type variable ‘c0’
because it is not a concrete ‘RuntimeRep’.
• In the first argument of ‘undefined’, namely
‘(undefined @(R @RuntimeRep))’
In the expression: undefined (undefined @(R @RuntimeRep))
In an equation for ‘foo’:
foo = undefined (undefined @(R @RuntimeRep))
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