[INFO] cloning repository https://github.com/alistairdavies/rust-text-editor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alistairdavies/rust-text-editor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falistairdavies%2Frust-text-editor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falistairdavies%2Frust-text-editor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a13060ed1d5ab28a1c89a9786160889ca8b30965
[INFO] checking alistairdavies/rust-text-editor/a13060ed1d5ab28a1c89a9786160889ca8b30965 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falistairdavies%2Frust-text-editor" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alistairdavies/rust-text-editor on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alistairdavies/rust-text-editor
[INFO] finished tweaking git repo https://github.com/alistairdavies/rust-text-editor
[INFO] tweaked toml for git repo https://github.com/alistairdavies/rust-text-editor written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/alistairdavies/rust-text-editor 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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 570fae3d886217bfc1287403760c870dc7e2d2d2097c7f568cf7edee267a5618
[INFO] running `Command { std: "docker" "start" "-a" "570fae3d886217bfc1287403760c870dc7e2d2d2097c7f568cf7edee267a5618", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "570fae3d886217bfc1287403760c870dc7e2d2d2097c7f568cf7edee267a5618", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "570fae3d886217bfc1287403760c870dc7e2d2d2097c7f568cf7edee267a5618", kill_on_drop: false }`
[INFO] [stdout] 570fae3d886217bfc1287403760c870dc7e2d2d2097c7f568cf7edee267a5618
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87cfcdc8747c98856ce91416d4a329dfe5cbb827f0d5f4ac9bd4ef48ad905468
[INFO] running `Command { std: "docker" "start" "-a" "87cfcdc8747c98856ce91416d4a329dfe5cbb827f0d5f4ac9bd4ef48ad905468", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.133
[INFO] [stderr]     Checking unicode-segmentation v1.10.0
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking rust-text-editor v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/editor.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |         let mut offset = &mut self.offset;
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/editor.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |         let mut offset = &mut self.offset;
[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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.15s
[INFO] running `Command { std: "docker" "inspect" "87cfcdc8747c98856ce91416d4a329dfe5cbb827f0d5f4ac9bd4ef48ad905468", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87cfcdc8747c98856ce91416d4a329dfe5cbb827f0d5f4ac9bd4ef48ad905468", kill_on_drop: false }`
[INFO] [stdout] 87cfcdc8747c98856ce91416d4a329dfe5cbb827f0d5f4ac9bd4ef48ad905468