Compilation warnings, is it ok?

[haijinSk]

Scryer version: https://github.com/mthom/scryer-prolog/tree/070f1e8dfae0b19c0b4257b27b9572176379e523

rustc version: 1.78.0

Two warnings:

$ cargo build --release
[...]
Compiling base64 v0.12.3
warning: struct `OrderedOpDirKey` is never constructed
  --> src/machine/machine_indices.rs:22:19
   |
22 | pub(crate) struct OrderedOpDirKey(pub(crate) Atom, pub(crate) Fixity);
   |                   ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: method `unify_big_num` is never used
   --> src/machine/unify.rs:456:8
    |
17  | pub(crate) trait Unifier: DerefMut<Target = MachineState> {
    |                  ------- method in this trait
...
456 |     fn unify_big_num<N>(&mut self, n1: TypedArenaPtr<N>, value: HeapCel...
    |        ^^^^^^^^^^^^^

warning: `scryer-prolog` (lib) generated 2 warnings
    Finished `release` profile [optimized] target(s) in 7m 14s

[aarroyoc]

It seems that the Rust compiler just got better at dead code detection. It's not something from our side, as going back as far as f734c273ca91a8ec8fa02c731fea2b468cfd7baa and compiling with Rust 1.78, generates the same warnings.

[aarroyoc]

#2410

[haijinSk]

Thank you.