[INFO] updating cached repository https://github.com/kuroega/rust_from_the_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a7f81d228dbf4042d3a2e02a087c307a20373d0d
[INFO] testing kuroega/rust_from_the_book against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkuroega%2Frust_from_the_book" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kuroega/rust_from_the_book on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kuroega/rust_from_the_book
[INFO] finished tweaking git repo https://github.com/kuroega/rust_from_the_book
[INFO] tweaked toml for git repo https://github.com/kuroega/rust_from_the_book written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/kuroega/rust_from_the_book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 813ebe189d974b3cc8aa9e9fc6d349e4c67ea93d03899b97deed76016ce9d484
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "813ebe189d974b3cc8aa9e9fc6d349e4c67ea93d03899b97deed76016ce9d484", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "813ebe189d974b3cc8aa9e9fc6d349e4c67ea93d03899b97deed76016ce9d484", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "813ebe189d974b3cc8aa9e9fc6d349e4c67ea93d03899b97deed76016ce9d484", kill_on_drop: false }`
[INFO] [stdout] 813ebe189d974b3cc8aa9e9fc6d349e4c67ea93d03899b97deed76016ce9d484
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bc551a7c6fa893c153a5111f36cb0f7d0fc1446c293aef1be403b928c7d7a97
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4bc551a7c6fa893c153a5111f36cb0f7d0fc1446c293aef1be403b928c7d7a97", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.83s
[INFO] running `Command { std: "docker" "inspect" "4bc551a7c6fa893c153a5111f36cb0f7d0fc1446c293aef1be403b928c7d7a97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bc551a7c6fa893c153a5111f36cb0f7d0fc1446c293aef1be403b928c7d7a97", kill_on_drop: false }`
[INFO] [stdout] 4bc551a7c6fa893c153a5111f36cb0f7d0fc1446c293aef1be403b928c7d7a97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7e83fcb43870afbcfb56160ba4f032371a4940e1431e2362853359626be67263
[INFO] running `Command { std: "docker" "start" "-a" "7e83fcb43870afbcfb56160ba4f032371a4940e1431e2362853359626be67263", kill_on_drop: false }`
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> examples/ownership_demo.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let s1 = gives_ownership();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> examples/ownership_demo.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let s3  = takes_and_gives_back(s2);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]  --> examples/struct_demo3.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     username: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> examples/struct_demo3.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     active: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `Command { std: "docker" "inspect" "7e83fcb43870afbcfb56160ba4f032371a4940e1431e2362853359626be67263", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e83fcb43870afbcfb56160ba4f032371a4940e1431e2362853359626be67263", kill_on_drop: false }`
[INFO] [stdout] 7e83fcb43870afbcfb56160ba4f032371a4940e1431e2362853359626be67263
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fb66f986c20e2eb9eba9df8126dfdfe662fa0e020148a09eb2e699aaa26c1f2d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fb66f986c20e2eb9eba9df8126dfdfe662fa0e020148a09eb2e699aaa26c1f2d", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> examples/ownership_demo.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let s1 = gives_ownership();
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]   --> examples/ownership_demo.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let s3  = takes_and_gives_back(s2);
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]  --> examples/struct_demo3.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 |     username: String,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> examples/struct_demo3.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     active: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/learn_rust-5bc7f5b338843c39
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests learn_rust
[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 `Command { std: "docker" "inspect" "fb66f986c20e2eb9eba9df8126dfdfe662fa0e020148a09eb2e699aaa26c1f2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb66f986c20e2eb9eba9df8126dfdfe662fa0e020148a09eb2e699aaa26c1f2d", kill_on_drop: false }`
[INFO] [stdout] fb66f986c20e2eb9eba9df8126dfdfe662fa0e020148a09eb2e699aaa26c1f2d