build error when try to build the tokio-uring

[gaowayne]

[root@localhost tokio-uring]# cargo build
    Updating crates.io index
  Downloaded pin-project-lite v0.2.9
  Downloaded mio v0.8.5
  Downloaded tokio v1.23.0
  Downloaded io-uring v0.5.11
  Downloaded 4 crates (786.6 KB) in 1.02s
   Compiling autocfg v1.1.0
   Compiling libc v0.2.139
   Compiling log v0.4.17
   Compiling cfg-if v1.0.0
   Compiling io-uring v0.5.11
   Compiling bitflags v1.3.2
   Compiling pin-project-lite v0.2.9
   Compiling tokio v1.23.0
   Compiling slab v0.4.7
   Compiling socket2 v0.4.7
   Compiling mio v0.8.5
   Compiling tokio-uring v0.4.0 (/mnt/sda/sda5/wayne/rust/tokio-uring)
error[E0658]: `let...else` statements are unstable
   --> src/buf/fixed/registry.rs:239:9
    |
239 | /         let BufState::Free { init_len } = *state else {
240 | |             return None
241 | |         };
    | |__________^
    |
    = note: see issue #87335 <https://github.com/rust-lang/rust/issues/87335> for more information

error[E0658]: use of unstable library feature 'future_poll_fn'
 --> src/io/shared_fd.rs:2:5
  |
2 | use std::future::poll_fn;
  |     ^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #72302 <https://github.com/rust-lang/rust/issues/72302> for more information

error[E0658]: use of unstable library feature 'future_poll_fn'
   --> src/io/shared_fd.rs:116:9
    |
116 |         poll_fn(|cx| {
    |         ^^^^^^^
    |
    = note: see issue #72302 <https://github.com/rust-lang/rust/issues/72302> for more information

error[E0658]: use of unstable library feature 'future_poll_fn'
   --> src/runtime/mod.rs:107:44
    |
107 |             .block_on(self.local.run_until(std::future::poll_fn(|cx| {
    |                                            ^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #72302 <https://github.com/rust-lang/rust/issues/72302> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `tokio-uring` due to 4 previous errors
warning: build failed, waiting for other jobs to finish...
error: build failed
[root@localhost tokio-uring]# 

[FrankReh]

Sorry, that first error makes it look like a newer rust compiler is needed. I think the project is still at the stage where it isn't trying to be compatible with older rust compiler versions. You may want to try on a machine where you can get rust and cargo of 1.66.0.

[gaowayne]

sorry, I am newbie to rust, is there any command that I can update my rust build tools?

[root@localhost tokio-uring]# cargo --version
cargo 1.56.0
[root@localhost tokio-uring]# cargo update
    Updating crates.io index
[root@localhost tokio-uring]# cargo --version
cargo 1.56.0
[root@localhost tokio-uring]# 

[paolobarbolini]

sorry, I am newbie to rust, is there any command that I can update my rust build tools?

You can use rustup update if you originally installed it via rustup.rs

[gaowayne]

thank you so much. now build is OK, but I cannot see any example binary is built

[root@localhost debug]# cd examples/
[root@localhost examples]# ls -l
total 0
[root@localhost examples]# pwd
/mnt/sda/sda5/wayne/rust/tokio-uring/target/debug/examples
[root@localhost examples]# 

[Noah-Kennedy]

Try this:

cargo build --examples

[FrankReh]

I'm going to close this. Please reopen if we've missed answering something. Thank you.

[Noah-Kennedy]

Also, if you keep having further issues, you can comment even if this is closed. We close issues to indicate that work doesn't need to be done on our end.