Could not compile the code

[DeliciousBounty]

error[E0658]: let...else statements are unstable
--> /home/nathan/.cargo/registry/src/github.com-1ecc6299db9ec823/fields-iter-macros-0.0.1/src/lib.rs:10:5
|
10 | / let syn::Data::Struct(strukt) = item.data else {
11 | | return syn::Error::new_spanned(&item, "only structs are supported for #[derive(FieldsInspect)]")
12 | | .into_compile_error()
13 | | .into();
14 | | };
| |______^
|
= note: see issue #87335 rust-lang/rust#87335 for more information
= help: add #![feature(let_else)] to the crate attributes to enable

For more information about this error, try rustc --explain E0658.
error: could not compile fields-iter-macros due to previous error

[ChayimFriedman2]

You're using an old version of Rust. Try updating it.