Here is yet another solution. The focus of this one is not to be short, but rather to provide error messages that refer to cas-cad-e and not to constructs that cas-cad-e expands to.
Extra tests are provided. -- Jens Axel Søgaard
cas-cad-e-test.rkt
Description: Binary data
cas-cad-e.rkt
Description: Binary data
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