[INFO] updating cached repository c4collins/rust-by-example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/c4collins/rust-by-example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/c4collins/rust-by-example" "work/ex/beta-1.38-1/sources/1.37.0/gh/c4collins/rust-by-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/c4collins/rust-by-example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/c4collins/rust-by-example" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/c4collins/rust-by-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/c4collins/rust-by-example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 93b426269e08f327892d00efd64e58e3c817f3d5
[INFO] sha for GitHub repo c4collins/rust-by-example: 93b426269e08f327892d00efd64e58e3c817f3d5
[INFO] validating manifest of c4collins/rust-by-example 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 c4collins/rust-by-example 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 c4collins/rust-by-example
[INFO] finished frobbing c4collins/rust-by-example
[INFO] frobbed toml for c4collins/rust-by-example written to work/ex/beta-1.38-1/sources/1.37.0/gh/c4collins/rust-by-example/Cargo.toml
[INFO] started frobbing c4collins/rust-by-example
[INFO] finished frobbing c4collins/rust-by-example
[INFO] frobbed toml for c4collins/rust-by-example written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/c4collins/rust-by-example/Cargo.toml
[INFO] crate c4collins/rust-by-example 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 c4collins/rust-by-example 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-3/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/c4collins/rust-by-example:/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] 5e2eab4ac1b5f622c3592836000760d99abcdf6a919ef5197afef2b46f396671
[INFO] running `"docker" "start" "-a" "5e2eab4ac1b5f622c3592836000760d99abcdf6a919ef5197afef2b46f396671"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling typename_derive v0.1.3
[INFO] [stderr]    Compiling typename v0.1.1
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `section_subtitle`
[INFO] [stderr]   --> src/helpers.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn section_subtitle (title: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.40s
[INFO] running `"docker" "inspect" "5e2eab4ac1b5f622c3592836000760d99abcdf6a919ef5197afef2b46f396671"`
[INFO] running `"docker" "rm" "-f" "5e2eab4ac1b5f622c3592836000760d99abcdf6a919ef5197afef2b46f396671"`
[INFO] [stdout] 5e2eab4ac1b5f622c3592836000760d99abcdf6a919ef5197afef2b46f396671
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/c4collins/rust-by-example:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] b1f25cd49ab3955863fef7ea76a899ddfad959daeed89d1925c922e3d09aef4e
[INFO] running `"docker" "start" "-a" "b1f25cd49ab3955863fef7ea76a899ddfad959daeed89d1925c922e3d09aef4e"`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `section_subtitle`
[INFO] [stderr]   --> src/helpers.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn section_subtitle (title: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `"docker" "inspect" "b1f25cd49ab3955863fef7ea76a899ddfad959daeed89d1925c922e3d09aef4e"`
[INFO] running `"docker" "rm" "-f" "b1f25cd49ab3955863fef7ea76a899ddfad959daeed89d1925c922e3d09aef4e"`
[INFO] [stdout] b1f25cd49ab3955863fef7ea76a899ddfad959daeed89d1925c922e3d09aef4e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/c4collins/rust-by-example:/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" "test" "--frozen"`
[INFO] [stdout] 924c13c6ddaef8de6779e6c994811f4c603960dc756b0b257a9636ba895903cd
[INFO] running `"docker" "start" "-a" "924c13c6ddaef8de6779e6c994811f4c603960dc756b0b257a9636ba895903cd"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rary-84a3cb96db4ddcc9
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_by_example-2864bdbe8e18eb40
[INFO] [stderr]    Doc-tests rary
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "924c13c6ddaef8de6779e6c994811f4c603960dc756b0b257a9636ba895903cd"`
[INFO] running `"docker" "rm" "-f" "924c13c6ddaef8de6779e6c994811f4c603960dc756b0b257a9636ba895903cd"`
[INFO] [stdout] 924c13c6ddaef8de6779e6c994811f4c603960dc756b0b257a9636ba895903cd