[INFO] cloning repository https://github.com/MadyLab/tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MadyLab/tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMadyLab%2Ftree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMadyLab%2Ftree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd523135f723bfdf2837a036f81777a48e63f257
[INFO] checking MadyLab/tree/dd523135f723bfdf2837a036f81777a48e63f257 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMadyLab%2Ftree" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MadyLab/tree on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MadyLab/tree
[INFO] finished tweaking git repo https://github.com/MadyLab/tree
[INFO] tweaked toml for git repo https://github.com/MadyLab/tree written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/MadyLab/tree 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7cc2ac81a86315eb7d3e99352cd6f5e74791fee56d192d0c66aa8869fe466373
[INFO] running `Command { std: "docker" "start" "-a" "7cc2ac81a86315eb7d3e99352cd6f5e74791fee56d192d0c66aa8869fe466373", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7cc2ac81a86315eb7d3e99352cd6f5e74791fee56d192d0c66aa8869fe466373", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cc2ac81a86315eb7d3e99352cd6f5e74791fee56d192d0c66aa8869fe466373", kill_on_drop: false }`
[INFO] [stdout] 7cc2ac81a86315eb7d3e99352cd6f5e74791fee56d192d0c66aa8869fe466373
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f757da546373294626dc8cff9dc567bd8213bc666fbcd7acf7e5d5d0ffd98307
[INFO] running `Command { std: "docker" "start" "-a" "f757da546373294626dc8cff9dc567bd8213bc666fbcd7acf7e5d5d0ffd98307", kill_on_drop: false }`
[INFO] [stderr]     Checking tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]   --> tests/merge.rs:18:65
[INFO] [stdout]    |
[INFO] [stdout] 18 |         .map(|(_, node)| node.children().next().unwrap().1.get().clone())
[INFO] [stdout]    |                                                                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> tests/clone.rs:15:75
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let node2_result: Vec<&str> = node2.children().map(|(edge, _)| (*edge).clone()).collect();
[INFO] [stdout]    |                                                                           ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> tests/clone.rs:18:75
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let node3_result: Vec<&str> = node3.children().map(|(edge, _)| (*edge).clone()).collect();
[INFO] [stdout]    |                                                                           ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "f757da546373294626dc8cff9dc567bd8213bc666fbcd7acf7e5d5d0ffd98307", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f757da546373294626dc8cff9dc567bd8213bc666fbcd7acf7e5d5d0ffd98307", kill_on_drop: false }`
[INFO] [stdout] f757da546373294626dc8cff9dc567bd8213bc666fbcd7acf7e5d5d0ffd98307