The `value_type` top-level command allows evaluating a term down to a
natural number, and using that number to define an enumerated type, as
well as (optionally) a constant definition.
Co-authored-by: Rafal Kolanski <rafal.kolanski@proofcraft.systems>
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
Gerwin Klein