Rocket does not compile on nightly-2021-10-15

[mpajkowski]

Description

Compilation fails with following error:

error[E0277]: the trait bound `(dyn catcher::handler::Handler + 'static): catcher::handler::Cloneable` is not satisfied
   --> /home/mpa/.cargo/registry/src/github.com-1ecc6299db9ec823/rocket-0.5.0-rc.1/src/catcher/handler.rs:150:14
    |
150 |         self.clone_handler()
    |              ^^^^^^^^^^^^^ the trait `catcher::handler::Cloneable` is not implemented for `(dyn catcher::handler::Handler + 'static)`

error[E0277]: the trait bound `(dyn route::handler::Handler + 'static): route::handler::Cloneable` is not satisfied
   --> /home/mpa/.cargo/registry/src/github.com-1ecc6299db9ec823/rocket-0.5.0-rc.1/src/route/handler.rs:316:14
    |
316 |         self.clone_handler()
    |              ^^^^^^^^^^^^^ the trait `route::handler::Cloneable` is not implemented for `(dyn route::handler::Handler + 'static)`

To Reproduce

main.rs:

fn main() {
    println!("Hello, world!");
}

Cargo.toml:

[package]
name = "rocket-build-failure"
version = "0.1.0"
edition = "2018"

[dependencies]
rocket = "0.5.0-rc.1"

rust-toolchain.toml:

[toolchain]
channel = "nightly-2021-10-15"

Environment:

• Arch Linux 5.4.12-arch1-1
• rocket 0.5.0-rc.1
• toolchain: nightly-x86_64-unknown-linux-gnu (c1026539b 2021-10-15)

[lambda-fairy]

A similar issue affects Rocket 0.4.10: rust-lang/rust#89935

[nbdd0121]

Minimised:

trait Foo: Baz {}
trait Bar {}
trait Baz: Bar {
    fn bar(&self);
}

impl<T: Foo> Bar for T {}
impl<T: Foo> Baz for T {
    fn bar(&self) {}
}

fn accept_foo(x: Box<dyn Foo>) {
    x.bar();
}

Oops... wrong repo, was trying to post to the rust issue. I guess I'll leave the comment here though :)

[helxsz]

same problem happened on me, any work around?

[lambda-fairy]

@helxsz rust-lang/rust#89935 (comment)

[pineapplehunter]

I think the same issue is happening with the latest beta.

$ cargo version
cargo 1.57.0-beta (c7957a74b 2021-10-11)

[lambda-fairy]

@pineapplehunter Yes, the rustc fix was also backported to beta 1.57

rust-lang/rust#90025 (comment)

[mpajkowski]

Right now rocket seems to compile just fine.

$ rustc -V
rustc 1.58.0-nightly (547a6ffee 2021-10-21)

[lambda-fairy]

Since the upstream issue has been fixed, @mpajkowski would you like to close this?