Fix lint errors with Rust 1.89

[theoparis]

I added a PartialEq impl because of this error:

error: function pointer comparisons do not produce meaningful results since their addresses are not guaranteed to be unique
  --> src-rs/func.rs:57:5
   |
54 | #[derive(PartialEq)]
   |          --------- in this derive macro expansion
...
57 |     pub func: MakeFuncImpl,
   |     ^^^^^^^^^^^^^^^^^^^^^^

[Colecf]

Please remove the lifetime on the argument, it's not necessary. Same in var.rs.

[Colecf]

Replaced with #298