[INFO] cloning repository https://github.com/juliofihdeldev/rust_advanced
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/juliofihdeldev/rust_advanced" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuliofihdeldev%2Frust_advanced", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuliofihdeldev%2Frust_advanced'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c3fa39a84a39816ee936cc6ae9cd09bcf58d0fb1
[INFO] testing juliofihdeldev/rust_advanced against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuliofihdeldev%2Frust_advanced" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/juliofihdeldev/rust_advanced
[INFO] finished tweaking git repo https://github.com/juliofihdeldev/rust_advanced
[INFO] tweaked toml for git repo https://github.com/juliofihdeldev/rust_advanced written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/juliofihdeldev/rust_advanced on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/juliofihdeldev/rust_advanced already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7ce2ec3c730dccc166bb4394802d2ae0fbd3b76d6a7977287c1a8622f3f3b13
[INFO] running `Command { std: "docker" "start" "-a" "c7ce2ec3c730dccc166bb4394802d2ae0fbd3b76d6a7977287c1a8622f3f3b13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7ce2ec3c730dccc166bb4394802d2ae0fbd3b76d6a7977287c1a8622f3f3b13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7ce2ec3c730dccc166bb4394802d2ae0fbd3b76d6a7977287c1a8622f3f3b13", kill_on_drop: false }`
[INFO] [stdout] c7ce2ec3c730dccc166bb4394802d2ae0fbd3b76d6a7977287c1a8622f3f3b13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30bf7da2dd6ec837ee3657a4611518de24fba45ad72ab62b96cc4dcb3e65c7a0
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[INFO] [stderr]    Compiling pulldown-cmark-escape v0.11.0
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling outro_08 v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/08_outro)
[INFO] [stderr]    Compiling string_cache v0.8.7
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[INFO] [stderr]    Compiling itertools v0.13.0
[INFO] [stderr]    Compiling bimap v0.6.3
[INFO] [stderr]    Compiling async_locks v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/06_async_aware_primitives)
[INFO] [stderr]    Compiling handlebars v5.1.2
[INFO] [stderr]    Compiling elasticlunr-rs v3.0.2
[INFO] [stderr]    Compiling pulldown-cmark-to-cmark v15.0.1
[INFO] [stderr]    Compiling async_fn v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/01_async_fn)
[INFO] [stderr]    Compiling cancellation v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/07_cancellation)
[INFO] [stdout] warning: unused variable: `listener`
[INFO] [stdout]   --> exercises/08_futures/01_async_fn/src/lib.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub async fn echo(listener: TcpListener) -> Result<(), anyhow::Error> {
[INFO] [stdout]    |                   ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_listener`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ammonia v4.0.0
[INFO] [stderr]    Compiling future v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/04_future)
[INFO] [stderr]    Compiling blocking v0.1.0 (/opt/rustwide/workdir/exercises/08_futures/05_blocking)
[INFO] [stdout] error: future cannot be sent between threads safely
[INFO] [stdout]    --> exercises/08_futures/04_future/src/lib.rs:9:18
[INFO] [stdout]     |
[INFO] [stdout]   9 |     tokio::spawn(example());
[INFO] [stdout]     |                  ^^^^^^^^^ future returned by `example` is not `Send`
[INFO] [stdout]     |
[INFO] [stdout]     = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<i32>`
[INFO] [stdout] note: future is not `Send` as this value is used across an await
[INFO] [stdout]    --> exercises/08_futures/04_future/src/lib.rs:14:17
[INFO] [stdout]     |
[INFO] [stdout]  13 |     let non_send = Rc::new(1);
[INFO] [stdout]     |         -------- has type `Rc<i32>` which is not `Send`
[INFO] [stdout]  14 |     yield_now().await;
[INFO] [stdout]     |                 ^^^^^ await occurs here, with `non_send` maybe used later
[INFO] [stdout] note: required by a bound in `tokio::spawn`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.39.2/src/task/spawn.rs:167:21
[INFO] [stdout]     |
[INFO] [stdout] 165 |     pub fn spawn<F>(future: F) -> JoinHandle<F::Output>
[INFO] [stdout]     |            ----- required by a bound in this function
[INFO] [stdout] 166 |     where
[INFO] [stdout] 167 |         F: Future + Send + 'static,
[INFO] [stdout]     |                     ^^^^ required by this bound in `spawn`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `future` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "30bf7da2dd6ec837ee3657a4611518de24fba45ad72ab62b96cc4dcb3e65c7a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30bf7da2dd6ec837ee3657a4611518de24fba45ad72ab62b96cc4dcb3e65c7a0", kill_on_drop: false }`
[INFO] [stdout] 30bf7da2dd6ec837ee3657a4611518de24fba45ad72ab62b96cc4dcb3e65c7a0
