[INFO] cloning repository https://github.com/Xedon/rust_workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Xedon/rust_workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5df7f56137bbc5afc828b4378f016ad869cf7760
[INFO] testing Xedon/rust_workshop against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXedon%2Frust_workshop" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Xedon/rust_workshop on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Xedon/rust_workshop
[INFO] finished tweaking git repo https://github.com/Xedon/rust_workshop
[INFO] tweaked toml for git repo https://github.com/Xedon/rust_workshop written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Xedon/rust_workshop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d8e32ead3c427828b1b385c0203c09541adcf0ec94ad39bbdc7ca2c4e064254
[INFO] running `Command { std: "docker" "start" "-a" "3d8e32ead3c427828b1b385c0203c09541adcf0ec94ad39bbdc7ca2c4e064254", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d8e32ead3c427828b1b385c0203c09541adcf0ec94ad39bbdc7ca2c4e064254", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d8e32ead3c427828b1b385c0203c09541adcf0ec94ad39bbdc7ca2c4e064254", kill_on_drop: false }`
[INFO] [stdout] 3d8e32ead3c427828b1b385c0203c09541adcf0ec94ad39bbdc7ca2c4e064254
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87ae47703b86e174b6ed8b0a2896c2d4ce1c173e3bf1a7cbe481270b1eef65ae
[INFO] running `Command { std: "docker" "start" "-a" "87ae47703b86e174b6ed8b0a2896c2d4ce1c173e3bf1a7cbe481270b1eef65ae", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-starter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `Command { std: "docker" "inspect" "87ae47703b86e174b6ed8b0a2896c2d4ce1c173e3bf1a7cbe481270b1eef65ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87ae47703b86e174b6ed8b0a2896c2d4ce1c173e3bf1a7cbe481270b1eef65ae", kill_on_drop: false }`
[INFO] [stdout] 87ae47703b86e174b6ed8b0a2896c2d4ce1c173e3bf1a7cbe481270b1eef65ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab7a087f1104bfd9badfec1e26a40aa5fdbf7d2dd85bfbf9f24e63acb1361c6f
[INFO] running `Command { std: "docker" "start" "-a" "ab7a087f1104bfd9badfec1e26a40aa5fdbf7d2dd85bfbf9f24e63acb1361c6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-starter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Error`
[INFO] [stdout]   --> examples/3_flow_control.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |         Error(String),
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str`
[INFO] [stdout]  --> examples/1_primitves.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let str = "str";
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]  --> examples/1_primitves.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let string = String::from("string");
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> examples/1_primitves.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x = 1;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> examples/1_primitves.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut x = "a";
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> examples/1_primitves.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let x = x;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.67s
[INFO] running `Command { std: "docker" "inspect" "ab7a087f1104bfd9badfec1e26a40aa5fdbf7d2dd85bfbf9f24e63acb1361c6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab7a087f1104bfd9badfec1e26a40aa5fdbf7d2dd85bfbf9f24e63acb1361c6f", kill_on_drop: false }`
[INFO] [stdout] ab7a087f1104bfd9badfec1e26a40aa5fdbf7d2dd85bfbf9f24e63acb1361c6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 36e956259914c777027dec0cdff1a3d6d77d544eb39a10a4aefa29f7f22b9af0
[INFO] running `Command { std: "docker" "start" "-a" "36e956259914c777027dec0cdff1a3d6d77d544eb39a10a4aefa29f7f22b9af0", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: variant is never constructed: `Error`
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> examples/3_flow_control.rs:41:9
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 41 |         Error(String),
[INFO] [stdout] 
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-starter` (example "3_flow_control") generated 1 warning
[INFO] [stderr] warning: unused variable: `str`
[INFO] [stderr]  --> examples/1_primitves.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let str = "str";
[INFO] [stderr]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]  --> examples/1_primitves.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let string = String::from("string");
[INFO] [stderr]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> examples/1_primitves.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let x = 1;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]   --> examples/1_primitves.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let mut x = "a";
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> examples/1_primitves.rs:49:13
[INFO] [stderr]    |
[INFO] [stderr] 49 |         let x = x;
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-starter` (example "1_primitves") generated 5 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_starter-88be034d812cb96f)
[INFO] running `Command { std: "docker" "inspect" "36e956259914c777027dec0cdff1a3d6d77d544eb39a10a4aefa29f7f22b9af0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36e956259914c777027dec0cdff1a3d6d77d544eb39a10a4aefa29f7f22b9af0", kill_on_drop: false }`
[INFO] [stdout] 36e956259914c777027dec0cdff1a3d6d77d544eb39a10a4aefa29f7f22b9af0