[INFO] cloning repository https://github.com/AlexanderSchuetz97/rco-cell
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AlexanderSchuetz97/rco-cell" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6b3619239a74883bf65adb1d64ed766d6d3d645
[INFO] checking AlexanderSchuetz97/rco-cell against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AlexanderSchuetz97/rco-cell on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] finished tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] tweaked toml for git repo https://github.com/AlexanderSchuetz97/rco-cell written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/AlexanderSchuetz97/rco-cell 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bf4c968b08a9533da7f9f9a61ae802eec096b0dbf88ecfaa619783e0e7ad2d6e
[INFO] running `Command { std: "docker" "start" "-a" "bf4c968b08a9533da7f9f9a61ae802eec096b0dbf88ecfaa619783e0e7ad2d6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bf4c968b08a9533da7f9f9a61ae802eec096b0dbf88ecfaa619783e0e7ad2d6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf4c968b08a9533da7f9f9a61ae802eec096b0dbf88ecfaa619783e0e7ad2d6e", kill_on_drop: false }`
[INFO] [stdout] bf4c968b08a9533da7f9f9a61ae802eec096b0dbf88ecfaa619783e0e7ad2d6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 750fdbcab66ea9e9ac2fe5082cd7b6c9676b695d16d6f65531d0b52e0cf93f32
[INFO] running `Command { std: "docker" "start" "-a" "750fdbcab66ea9e9ac2fe5082cd7b6c9676b695d16d6f65531d0b52e0cf93f32", kill_on_drop: false }`
[INFO] [stderr]     Checking rco-cell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1045:9
[INFO] [stdout]      |
[INFO] [stdout] 1045 |     use std::cell::RefCell;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `RefCell` is already imported here
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1048:9
[INFO] [stdout]      |
[INFO] [stdout] 1048 |     use std::rc::Rc;
[INFO] [stdout]      |         ^^^^^^^^^^^
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `Rc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "750fdbcab66ea9e9ac2fe5082cd7b6c9676b695d16d6f65531d0b52e0cf93f32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "750fdbcab66ea9e9ac2fe5082cd7b6c9676b695d16d6f65531d0b52e0cf93f32", kill_on_drop: false }`
[INFO] [stdout] 750fdbcab66ea9e9ac2fe5082cd7b6c9676b695d16d6f65531d0b52e0cf93f32
[INFO] checking AlexanderSchuetz97/rco-cell against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexanderSchuetz97%2Frco-cell" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AlexanderSchuetz97/rco-cell on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] finished tweaking git repo https://github.com/AlexanderSchuetz97/rco-cell
[INFO] tweaked toml for git repo https://github.com/AlexanderSchuetz97/rco-cell written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/AlexanderSchuetz97/rco-cell 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 60e6d27cd71a9f79769a2772efc48b47eead09d15f6ffb6433d79e360dd7233c
[INFO] running `Command { std: "docker" "start" "-a" "60e6d27cd71a9f79769a2772efc48b47eead09d15f6ffb6433d79e360dd7233c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60e6d27cd71a9f79769a2772efc48b47eead09d15f6ffb6433d79e360dd7233c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60e6d27cd71a9f79769a2772efc48b47eead09d15f6ffb6433d79e360dd7233c", kill_on_drop: false }`
[INFO] [stdout] 60e6d27cd71a9f79769a2772efc48b47eead09d15f6ffb6433d79e360dd7233c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1c754558993d11328adf6da4551bc003519030e7ec293defadb9a9860c9dfa75
[INFO] running `Command { std: "docker" "start" "-a" "1c754558993d11328adf6da4551bc003519030e7ec293defadb9a9860c9dfa75", kill_on_drop: false }`
[INFO] [stderr]     Checking rco-cell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1045:9
[INFO] [stdout]      |
[INFO] [stdout] 1045 |     use std::cell::RefCell;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `RefCell` is already imported here
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]     --> src/lib.rs:1048:9
[INFO] [stdout]      |
[INFO] [stdout] 1048 |     use std::rc::Rc;
[INFO] [stdout]      |         ^^^^^^^^^^^
[INFO] [stdout] 1049 |     use crate::*;
[INFO] [stdout]      |         -------- the item `Rc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "1c754558993d11328adf6da4551bc003519030e7ec293defadb9a9860c9dfa75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c754558993d11328adf6da4551bc003519030e7ec293defadb9a9860c9dfa75", kill_on_drop: false }`
[INFO] [stdout] 1c754558993d11328adf6da4551bc003519030e7ec293defadb9a9860c9dfa75