[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] building fteychene/rust-error-playground against master#461e8078010433ff7de2db2aaae8a3cfb0847215 for pr-94962
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffteychene%2Frust-error-playground" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fteychene/rust-error-playground on toolchain 461e8078010433ff7de2db2aaae8a3cfb0847215
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+461e8078010433ff7de2db2aaae8a3cfb0847215" "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-18/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" "+461e8078010433ff7de2db2aaae8a3cfb0847215" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+461e8078010433ff7de2db2aaae8a3cfb0847215" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0f644fc48f694aa5e9a73d7e5372e16ec8eb974b922d4bd7ef6c5ed954eb7e2
[INFO] running `Command { std: "docker" "start" "-a" "a0f644fc48f694aa5e9a73d7e5372e16ec8eb974b922d4bd7ef6c5ed954eb7e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0f644fc48f694aa5e9a73d7e5372e16ec8eb974b922d4bd7ef6c5ed954eb7e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0f644fc48f694aa5e9a73d7e5372e16ec8eb974b922d4bd7ef6c5ed954eb7e2", kill_on_drop: false }`
[INFO] [stdout] a0f644fc48f694aa5e9a73d7e5372e16ec8eb974b922d4bd7ef6c5ed954eb7e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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=forbid" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+461e8078010433ff7de2db2aaae8a3cfb0847215" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85412fa168dee4e45167d3b9b14301337054a310637610adb06dec46e14b117e
[INFO] running `Command { std: "docker" "start" "-a" "85412fa168dee4e45167d3b9b14301337054a310637610adb06dec46e14b117e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]    Compiling regex v1.3.1
[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 6.93s
[INFO] running `Command { std: "docker" "inspect" "85412fa168dee4e45167d3b9b14301337054a310637610adb06dec46e14b117e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85412fa168dee4e45167d3b9b14301337054a310637610adb06dec46e14b117e", kill_on_drop: false }`
[INFO] [stdout] 85412fa168dee4e45167d3b9b14301337054a310637610adb06dec46e14b117e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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=forbid" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+461e8078010433ff7de2db2aaae8a3cfb0847215" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2085307e8b2e13049d16a794ed41d97d7fb9694c6097cd57696e6cf2bda062b3
[INFO] running `Command { std: "docker" "start" "-a" "2085307e8b2e13049d16a794ed41d97d7fb9694c6097cd57696e6cf2bda062b3", 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 test [unoptimized + debuginfo] target(s) in 0.49s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/vanilla-d4396e7671f1963d)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/vanillacustom-c7e24f0cd0890aee)
[INFO] running `Command { std: "docker" "inspect" "2085307e8b2e13049d16a794ed41d97d7fb9694c6097cd57696e6cf2bda062b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2085307e8b2e13049d16a794ed41d97d7fb9694c6097cd57696e6cf2bda062b3", kill_on_drop: false }`
[INFO] [stdout] 2085307e8b2e13049d16a794ed41d97d7fb9694c6097cd57696e6cf2bda062b3