[INFO] updating cached repository cesare/rust-experiments
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cesare/rust-experiments
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cesare/rust-experiments" "work/ex/beta-1.38-1/sources/1.37.0/gh/cesare/rust-experiments"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cesare/rust-experiments'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cesare/rust-experiments" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cesare/rust-experiments"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cesare/rust-experiments'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d63917501910dedbf6ec9a48562f31185df1e918
[INFO] sha for GitHub repo cesare/rust-experiments: d63917501910dedbf6ec9a48562f31185df1e918
[INFO] validating manifest of cesare/rust-experiments on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cesare/rust-experiments on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cesare/rust-experiments
[INFO] finished frobbing cesare/rust-experiments
[INFO] frobbed toml for cesare/rust-experiments written to work/ex/beta-1.38-1/sources/1.37.0/gh/cesare/rust-experiments/Cargo.toml
[INFO] started frobbing cesare/rust-experiments
[INFO] finished frobbing cesare/rust-experiments
[INFO] frobbed toml for cesare/rust-experiments written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cesare/rust-experiments/Cargo.toml
[INFO] crate cesare/rust-experiments already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cesare/rust-experiments against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cesare/rust-experiments:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 10bc0cafacc8055aa00868d40274d1994d9ea6adcd71111560defceaa69f62c7
[INFO] running `"docker" "start" "-a" "10bc0cafacc8055aa00868d40274d1994d9ea6adcd71111560defceaa69f62c7"`
[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/crater/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" "10bc0cafacc8055aa00868d40274d1994d9ea6adcd71111560defceaa69f62c7"`
[INFO] running `"docker" "rm" "-f" "10bc0cafacc8055aa00868d40274d1994d9ea6adcd71111560defceaa69f62c7"`
[INFO] [stdout] 10bc0cafacc8055aa00868d40274d1994d9ea6adcd71111560defceaa69f62c7