[INFO] cloning repository https://github.com/shuqiangzhou/rust_variables
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shuqiangzhou/rust_variables" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshuqiangzhou%2Frust_variables", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshuqiangzhou%2Frust_variables'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ebf064210bf12243c47f5a8174b0809340bc3f2
[INFO] checking shuqiangzhou/rust_variables against try#1f5783cbeb5da8b38566d718631d016891e9c912 for pr-142704
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshuqiangzhou%2Frust_variables" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shuqiangzhou/rust_variables on toolchain 1f5783cbeb5da8b38566d718631d016891e9c912
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shuqiangzhou/rust_variables
[INFO] finished tweaking git repo https://github.com/shuqiangzhou/rust_variables
[INFO] tweaked toml for git repo https://github.com/shuqiangzhou/rust_variables written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/shuqiangzhou/rust_variables 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" "+1f5783cbeb5da8b38566d718631d016891e9c912" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5e57398ab7d37280bb237bacfd417f156eb76bc9a2b0eaeb1ef1ed9e5f6f44a
[INFO] running `Command { std: "docker" "start" "-a" "d5e57398ab7d37280bb237bacfd417f156eb76bc9a2b0eaeb1ef1ed9e5f6f44a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5e57398ab7d37280bb237bacfd417f156eb76bc9a2b0eaeb1ef1ed9e5f6f44a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5e57398ab7d37280bb237bacfd417f156eb76bc9a2b0eaeb1ef1ed9e5f6f44a", kill_on_drop: false }`
[INFO] [stdout] d5e57398ab7d37280bb237bacfd417f156eb76bc9a2b0eaeb1ef1ed9e5f6f44a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 657a745842f7499d99cf16a3628a5175f0fb616c032a4251c1ab634296cf344b
[INFO] running `Command { std: "docker" "start" "-a" "657a745842f7499d99cf16a3628a5175f0fb616c032a4251c1ab634296cf344b", kill_on_drop: false }`
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stdout]   --> src/bin/char.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 | /     (c as u32).to_be_bytes().map(|char| {
[INFO] [stdout] 68 | |         if char > 0 {
[INFO] [stdout] 69 | |             bin_yan.push_str(format!("{:0>8b}_", char).as_str());   
[INFO] [stdout] ...  |
[INFO] [stdout] 74 | |         );
[INFO] [stdout] 75 | |     });
[INFO] [stdout]    | |______^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = (c as u32).to_be_bytes().map(|char| {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stdout]   --> src/bin/char.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 | /     (c as u32).to_be_bytes().map(|char| {
[INFO] [stdout] 68 | |         if char > 0 {
[INFO] [stdout] 69 | |             bin_yan.push_str(format!("{:0>8b}_", char).as_str());   
[INFO] [stdout] ...  |
[INFO] [stdout] 74 | |         );
[INFO] [stdout] 75 | |     });
[INFO] [stdout]    | |______^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = (c as u32).to_be_bytes().map(|char| {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "657a745842f7499d99cf16a3628a5175f0fb616c032a4251c1ab634296cf344b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "657a745842f7499d99cf16a3628a5175f0fb616c032a4251c1ab634296cf344b", kill_on_drop: false }`
[INFO] [stdout] 657a745842f7499d99cf16a3628a5175f0fb616c032a4251c1ab634296cf344b