[isabelle] Code equations for Rep in lift_definition with type constructor
I am stuck trying to get an example to generate executable code. A
stripped down version is attached. I define a type "my_nat", set up as a
trivial quotient of nat. I lift a definition
definition all_zeros :: "nat list => bool"
lift_definition my_all_zeros :: "my_nat list => bool" is all_zeros .
When I attempt to export the code of the lifted function, I get the
error "No code equations for Rep_my_nat".
It looks like this is caused by the code equation for my_all_zeros
working out as
my_all_zeros ?xa ≡ all_zeros (map Rep_my_nat ?xa)
Is there a way to make code generation work with this quotient/lifting
setup? I found the "code_dt" flag to lift_definition, which seems to be
documented in isar-ref as dealing with something vaguely related, but it
doesn't affect the behaviour here.
theory Test imports Main begin
typedef my_nat = "UNIV :: (nat) set" ..
definition all_zeros :: "nat list \<Rightarrow> bool" where
"all_zeros nl = list_all (\<lambda>n. n = 0) nl"
lift_definition(code_dt) my_all_zeros :: "my_nat list \<Rightarrow> bool" is all_zeros .
export_code open my_all_zeros
(* Error: No code equations for Rep_my_nat *)
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