Function authorize_procedure 

pub fn authorize_procedure<A>(
    allow_policies: &[ProcedurePolicy],
    deny_policies: &[ProcedurePolicy],
    args: &A,
    ctx: &CratestackContext,
) -> Result<(), CratestackError>
where
    A: ProcedureArgs + ?Sized,

Evaluate a procedure-dialect policy. Deny-by-default: an empty allow_policies refuses everyone.