[INFO] updating cached repository https://github.com/cesare/rust-experiments
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d63917501910dedbf6ec9a48562f31185df1e918
[INFO] testing cesare/rust-experiments against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcesare%2Frust-experiments" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cesare/rust-experiments on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/cesare/rust-experiments
[INFO] finished tweaking git repo https://github.com/cesare/rust-experiments
[INFO] tweaked toml for git repo https://github.com/cesare/rust-experiments written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/cesare/rust-experiments already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] b9fab45cb506cb1b733627618c9403d6392c70ce1525c3756911ef4e126a5e8b
[INFO] running `"docker" "start" "-a" "b9fab45cb506cb1b733627618c9403d6392c70ce1525c3756911ef4e126a5e8b"`
[INFO] [stderr]    Compiling serde v0.9.11
[INFO] [stderr]    Compiling syn v0.11.9
[INFO] [stderr]    Compiling serde_codegen_internals v0.14.1
[INFO] [stderr]    Compiling serde_derive v0.9.11
[INFO] [stderr]    Compiling toml v0.3.1
[INFO] [stderr]    Compiling rust-experiments v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0425]: cannot find value `s` in this scope
[INFO] [stderr]   --> src/cargo-toml.rs:40:40
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let cargo: Cargo = toml::from_str(&s).unwrap();
[INFO] [stderr]    |                                        ^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `toml::Value`
[INFO] [stderr]  --> src/cargo-toml.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use toml::Value;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `proceed_upto`
[INFO] [stderr]   --> src/prime.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     fn proceed_upto(&mut self, n: u64) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0425`.
[INFO] [stderr] error: could not compile `rust-experiments`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b9fab45cb506cb1b733627618c9403d6392c70ce1525c3756911ef4e126a5e8b"`
[INFO] running `"docker" "rm" "-f" "b9fab45cb506cb1b733627618c9403d6392c70ce1525c3756911ef4e126a5e8b"`
[INFO] [stdout] b9fab45cb506cb1b733627618c9403d6392c70ce1525c3756911ef4e126a5e8b