error[E0433]: failed to resolve: could not find Advice in memmap2

[hornta]

I'm trying to build a rust project on Windows 11 but it yields an error.

I've never built anything before in rust so I don't know what I should troubleshoot.

cargo version: cargo 1.74.1 (ecb9851af 2023-10-18)

rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.74.1 (a28077b28 2023-12-04)`

error[E0433]: failed to resolve: could not find `Advice` in `memmap2`
  --> src\main.rs:83:30
   |
83 |         mmap.advise(memmap2::Advice::HugePage).unwrap();
   |                              ^^^^^^ could not find `Advice` in `memmap2`

error[E0599]: no method named `advise` found for struct `memmap2::Mmap` in the current scope
  --> src\main.rs:83:14
   |
83 |         mmap.advise(memmap2::Advice::HugePage).unwrap();
   |              ^^^^^^ method not found in `Mmap`

Some errors have detailed explanations: E0433, E0599.
For more information about an error, try `rustc --explain E0433`.
error: could not compile `parser` (bin "parser") due to 2 previous errors

[adamreichold]

The problem is that this functionality is not available on Windows but only Unix-like systems, hence the compiler cannot find it.

If you are working on a cross-platform project and you want to optionally use this code on Unix-like systems, you could use conditional compilation via the #[cfg(unix)] attribute to include it only where the functionality is available.