Fails to build with latest nightly

[zhihu]

Fails to build with latest nightly

[sunxiaoguang]

Hi Alexander,

Thank you for reporting this issue. Could you please try building rucene with rust nightly-2019-10-28 which is specified in rust-toolchain? FnBox was removed recently and somehow your cargo is not using rust version specified in rust-toolchain.

Please let me know if you still have issues with it after switching to nightly-2019-10-28. And here are the commit and issue related to removing of FnBox.
rust-lang/rust#62043
rust-lang/rust#28796

[atombender]

Sorry, wasn't aware of the rust-toolchain file. Installing that nightly doesn't resolve anything, unfortunately:

$ rustup run nightly-2019-10-28 cargo build
   Compiling rucene v0.1.0
error[E0432]: unresolved import `std::boxed::FnBox`
  --> /Users/alex/.cargo/registry/src/github.com-1ecc6299db9ec823/rucene-0.1.0/src/core/util/thread_pool.rs:27:5
   |
27 | use std::boxed::FnBox;
   |     ^^^^^^^^^^^^^^^^^ no `FnBox` in `boxed`

error: aborting due to previous error

[sunxiaoguang]

Can you try rustc --version to check what's the actual version it is using?

[atombender]

Sure:

$ rustc --version
rustc 1.40.0-nightly (95f437b3c 2019-10-27)
$ rustup which rustc
/Users/alex/.rustup/toolchains/nightly-2019-10-28-x86_64-apple-darwin/bin/rustc

Not sure why the discrepancy (2019-10-27 vs. 2019-10-28) here.

[sunxiaoguang]

Hm, that's weird. BTW: 2019-10-27 is the actual build date which is correct.

It works here and we are both using Mac so there shouldn't be anything related to specific platform.

Sorry that I'm kind of very busy right now and will come back later with this issue soon. Thank you.

[atombender]

Thanks!

[sunxiaoguang]

Hi Alexander,

I finally know what's happening now. I overlooked that you were using rucene in your project and the compiler is complaining about a very old version which is still using FnBox.

The root cause was that we haven't published any update to crates.io for quite some time. In order to fix this issue, I just published a new version with latest updates. Please run cargo update to update it, Sorry for the inconvenience, hopefully we can put some more resources to maintain a release cycle later on.

[atombender]

Sorry, should have been explicit; I am indeed trying to import Rucene into an app. Works now, thanks for the fix!

[sunxiaoguang]

Sorry, should have been explicit; I am indeed trying to import Rucene into an app. Works now, thanks for the fix!

Thank you for trying rucene. If you have any questions about using it, please don't hesitate to let me know.