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T7788.hs:9:7:
Reduction stack overflow; size = 201
When simplifying the following type: F (Id (Fix Id))
Use -freduction-depth=0 to disable this check
(any upper bound you could choose might fail unpredictably with
minor updates to GHC, so disabling the check is recommended if
you're sure that type checking should terminate)
In the expression: undefined
In an equation for ‘foo’: foo = undefined
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