[INFO] cloning repository https://github.com/galenchurch/mainloop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/galenchurch/mainloop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgalenchurch%2Fmainloop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgalenchurch%2Fmainloop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dba61fc439062766524e2cd897f28fd5a9d4aea3
[INFO] building galenchurch/mainloop against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgalenchurch%2Fmainloop" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/galenchurch/mainloop on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6-tc1/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/galenchurch/mainloop
[INFO] finished tweaking git repo https://github.com/galenchurch/mainloop
[INFO] tweaked toml for git repo https://github.com/galenchurch/mainloop written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/galenchurch/mainloop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc24144d51b14873a0cdf404f61b481d80311d6ff211d4b7f11c5905534bdfb2
[INFO] running `Command { std: "docker" "start" "-a" "dc24144d51b14873a0cdf404f61b481d80311d6ff211d4b7f11c5905534bdfb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc24144d51b14873a0cdf404f61b481d80311d6ff211d4b7f11c5905534bdfb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc24144d51b14873a0cdf404f61b481d80311d6ff211d4b7f11c5905534bdfb2", kill_on_drop: false }`
[INFO] [stdout] dc24144d51b14873a0cdf404f61b481d80311d6ff211d4b7f11c5905534bdfb2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f2713d2027a88db97e834dcb5215d5ddcc80087a254f4d93cbd828a2bea3df7a
[INFO] running `Command { std: "docker" "start" "-a" "f2713d2027a88db97e834dcb5215d5ddcc80087a254f4d93cbd828a2bea3df7a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling mainloop v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:111:14
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let (tx, mut rx) = mpsc::channel::<String>();
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.09s
[INFO] running `Command { std: "docker" "inspect" "f2713d2027a88db97e834dcb5215d5ddcc80087a254f4d93cbd828a2bea3df7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2713d2027a88db97e834dcb5215d5ddcc80087a254f4d93cbd828a2bea3df7a", kill_on_drop: false }`
[INFO] [stdout] f2713d2027a88db97e834dcb5215d5ddcc80087a254f4d93cbd828a2bea3df7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 139d828091c405329ff63bd5bcc2d2a31056aff19368db55e38b3737b021060a
[INFO] running `Command { std: "docker" "start" "-a" "139d828091c405329ff63bd5bcc2d2a31056aff19368db55e38b3737b021060a", kill_on_drop: false }`
[INFO] [stderr]    Compiling mainloop v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:111:14
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let (tx, mut rx) = mpsc::channel::<String>();
[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] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "139d828091c405329ff63bd5bcc2d2a31056aff19368db55e38b3737b021060a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "139d828091c405329ff63bd5bcc2d2a31056aff19368db55e38b3737b021060a", kill_on_drop: false }`
[INFO] [stdout] 139d828091c405329ff63bd5bcc2d2a31056aff19368db55e38b3737b021060a