[INFO] cloning repository https://github.com/McHammer18/combiner
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/McHammer18/combiner" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcHammer18%2Fcombiner", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcHammer18%2Fcombiner'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e75475b6aaa16aabbdf3320ef9d83a35b85f22ea
[INFO] checking McHammer18/combiner against try#4e55a504843955c97eb06907c71f6f3e99208021 for pr-146978
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcHammer18%2Fcombiner" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/McHammer18/combiner
[INFO] finished tweaking git repo https://github.com/McHammer18/combiner
[INFO] tweaked toml for git repo https://github.com/McHammer18/combiner written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/McHammer18/combiner on toolchain 4e55a504843955c97eb06907c71f6f3e99208021
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/McHammer18/combiner 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" "+4e55a504843955c97eb06907c71f6f3e99208021" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 601f5d1cbc0854aca5ff031e166db6cb9965741dab72f38c31895ff98c108bd0
[INFO] running `Command { std: "docker" "start" "-a" "601f5d1cbc0854aca5ff031e166db6cb9965741dab72f38c31895ff98c108bd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "601f5d1cbc0854aca5ff031e166db6cb9965741dab72f38c31895ff98c108bd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "601f5d1cbc0854aca5ff031e166db6cb9965741dab72f38c31895ff98c108bd0", kill_on_drop: false }`
[INFO] [stdout] 601f5d1cbc0854aca5ff031e166db6cb9965741dab72f38c31895ff98c108bd0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c0be8c42841d89c9abbbf9abbc0b8a99fe91b58ceea321c5a01101367c711c2
[INFO] running `Command { std: "docker" "start" "-a" "0c0be8c42841d89c9abbbf9abbc0b8a99fe91b58ceea321c5a01101367c711c2", kill_on_drop: false }`
[INFO] [stderr]     Checking combiner v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `image1`, `image2`, and `output` are never read
[INFO] [stdout]   --> src/args.rs:8:9
[INFO] [stdout]    |
[INFO] [stdout]  7 | pub struct Args {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout]  8 |     pub image1: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]  9 |     pub image2: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 10 |     pub output: String
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `image1`, `image2`, and `output` are never read
[INFO] [stdout]   --> src/args.rs:8:9
[INFO] [stdout]    |
[INFO] [stdout]  7 | pub struct Args {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout]  8 |     pub image1: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]  9 |     pub image2: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 10 |     pub output: String
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "0c0be8c42841d89c9abbbf9abbc0b8a99fe91b58ceea321c5a01101367c711c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c0be8c42841d89c9abbbf9abbc0b8a99fe91b58ceea321c5a01101367c711c2", kill_on_drop: false }`
[INFO] [stdout] 0c0be8c42841d89c9abbbf9abbc0b8a99fe91b58ceea321c5a01101367c711c2