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T19709b.hs:11:15: error: [GHC-55287]
• The argument ‘(error @Any "e2")’ of ‘levfun’
does not have a fixed runtime representation.
Its type is:
a1 :: TYPE r0
Cannot unify ‘Any’ with the type variable ‘r0’
because it is not a concrete ‘RuntimeRep’.
• In the first argument of ‘levfun’, namely ‘(error @Any "e2")’
In the first argument of ‘seq’, namely ‘levfun (error @Any "e2")’
In the expression: levfun (error @Any "e2") `seq` return []
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