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    • Proposal-option

    Proposal-option-case

    Case macro for the different kinds of proposal-option structures.

    This is an ACL2::fty sum-type case macro, typically introduced by fty::defflexsum or fty::deftagsum. It allows you to safely check the type of a proposal-option structure, or to split into cases based on its type.

    Short Form

    In its short form, proposal-option-case allows you to safely check the type of a proposal-option structure. For example:

    (proposal-option-case x :none)

    can be used to determine whether x is a none instead of some other kind of proposal-option structure.

    Long Form

    In its longer form, proposal-option-case allows you to split into cases based on the kind of structure you are looking at. A typical example would be:

    (proposal-option-case x
      :none ...
      :some ...)

    It is also possible to consolidate ``uninteresting'' cases using :otherwise.

    For convenience, the case macro automatically binds the fields of x for you, as appropriate for each case. That is, in the :none case, you can use fty::defprod-style foo.bar style accessors for x without having to explicitly add a none b* binder.