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To: garrigue@math.nagoya-u.ac.jp
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Native delimited continuations for bytecode
   OCaml
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Jacques Garrigue wrote:
>> Fatal error: exception Invalid_argument("output_value: abstract value
>> (Custom)")

> it just says that the marshaller encountered a custom C value.

But there are no such values in my code: C functions return either
Val_long, Val_unit, or a tuple with the tag 0 rather than
Custom_tag. The custom value must be referenced in the custom stack
fragement...