Add testcase of underk --- fails occurs check#36
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Perhaps can skip inference phase? Or else wrap resume into a datatype to hide the recursion
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This test case ensures
underkgive the correct semantics when handling of a tail-resumptive operationgets interrupted, and resumed under changed enclosing handlers.
The occurs check prevents us leaking the resumption as we need to. We could either subvert the type-system (writing an inference phase which only adds effect labels to handler + perform-sites), or add datatypes and 'hide' the recursion in an inductive type.