[INFO] cloning repository https://github.com/fteychene/rust-error-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fteychene/rust-error-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffteychene%2Frust-error-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffteychene%2Frust-error-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa8ce5306515ca1d2c77d022d760ab7c00360f86
[INFO] testing fteychene/rust-error-playground against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffteychene%2Frust-error-playground" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fteychene/rust-error-playground 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/fteychene/rust-error-playground
[INFO] finished tweaking git repo https://github.com/fteychene/rust-error-playground
[INFO] tweaked toml for git repo https://github.com/fteychene/rust-error-playground written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/fteychene/rust-error-playground 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 75567ca42ea75d83a6211c4f21d1198fe061eca024ece5b3dfa86c6ff92a5357
[INFO] running `Command { std: "docker" "start" "-a" "75567ca42ea75d83a6211c4f21d1198fe061eca024ece5b3dfa86c6ff92a5357", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75567ca42ea75d83a6211c4f21d1198fe061eca024ece5b3dfa86c6ff92a5357", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75567ca42ea75d83a6211c4f21d1198fe061eca024ece5b3dfa86c6ff92a5357", kill_on_drop: false }`
[INFO] [stdout] 75567ca42ea75d83a6211c4f21d1198fe061eca024ece5b3dfa86c6ff92a5357
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 34b0f41a5a9629bf3c0d3f9fb92c80997b0aa67ba982abc0f22548b04d80dc75
[INFO] running `Command { std: "docker" "start" "-a" "34b0f41a5a9629bf3c0d3f9fb92c80997b0aa67ba982abc0f22548b04d80dc75", kill_on_drop: false }`
[INFO] [stderr]    Compiling vanillacustom v0.1.0 (/opt/rustwide/workdir/vanillacustom)
[INFO] [stderr]    Compiling vanilla v0.1.0 (/opt/rustwide/workdir/vanilla)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> vanilla/src/main.rs:34:18
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn remove_header(mut chapters: Vec<String>) -> Result<Vec<String>, Box<dyn Error>> {
[INFO] [stdout]    |                  ----^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.30s
[INFO] running `Command { std: "docker" "inspect" "34b0f41a5a9629bf3c0d3f9fb92c80997b0aa67ba982abc0f22548b04d80dc75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34b0f41a5a9629bf3c0d3f9fb92c80997b0aa67ba982abc0f22548b04d80dc75", kill_on_drop: false }`
[INFO] [stdout] 34b0f41a5a9629bf3c0d3f9fb92c80997b0aa67ba982abc0f22548b04d80dc75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 1805e131b290b37e946d3717ca723d34b20a0030e1ed64782aeb9fc6dd56e3da
[INFO] running `Command { std: "docker" "start" "-a" "1805e131b290b37e946d3717ca723d34b20a0030e1ed64782aeb9fc6dd56e3da", kill_on_drop: false }`
[INFO] [stderr]    Compiling vanilla v0.1.0 (/opt/rustwide/workdir/vanilla)
[INFO] [stderr]    Compiling vanillacustom v0.1.0 (/opt/rustwide/workdir/vanillacustom)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> vanilla/src/main.rs:34:18
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn remove_header(mut chapters: Vec<String>) -> Result<Vec<String>, Box<dyn Error>> {
[INFO] [stdout]    |                  ----^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `Command { std: "docker" "inspect" "1805e131b290b37e946d3717ca723d34b20a0030e1ed64782aeb9fc6dd56e3da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1805e131b290b37e946d3717ca723d34b20a0030e1ed64782aeb9fc6dd56e3da", kill_on_drop: false }`
[INFO] [stdout] 1805e131b290b37e946d3717ca723d34b20a0030e1ed64782aeb9fc6dd56e3da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 805d20d018e3b88f3a42d78141b2932eecd1ccf65831ffd2aefdfbe021470406
[INFO] running `Command { std: "docker" "start" "-a" "805d20d018e3b88f3a42d78141b2932eecd1ccf65831ffd2aefdfbe021470406", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> vanilla/src/main.rs:34:18
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn remove_header(mut chapters: Vec<String>) -> Result<Vec<String>, Box<dyn Error>> {
[INFO] [stderr]    |                  ----^^^^^^^^
[INFO] [stderr]    |                  |
[INFO] [stderr]    |                  help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `vanilla` (bin "vanilla" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/vanilla-bed9f39ef5f72c76)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/vanillacustom-8d417a6fcadf40dd)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "805d20d018e3b88f3a42d78141b2932eecd1ccf65831ffd2aefdfbe021470406", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "805d20d018e3b88f3a42d78141b2932eecd1ccf65831ffd2aefdfbe021470406", kill_on_drop: false }`
[INFO] [stdout] 805d20d018e3b88f3a42d78141b2932eecd1ccf65831ffd2aefdfbe021470406