[INFO] cloning repository https://github.com/emersonmde/maybe
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/emersonmde/maybe" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fmaybe", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fmaybe'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d4e58704aa697f3e9aada5e3e4fcf6939f8ff601
[INFO] checking emersonmde/maybe against try#fa4dd1f19bfeb3fd235dc7f1406c42404436bef5 for pr-145108-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femersonmde%2Fmaybe" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/emersonmde/maybe
[INFO] finished tweaking git repo https://github.com/emersonmde/maybe
[INFO] tweaked toml for git repo https://github.com/emersonmde/maybe written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/emersonmde/maybe on toolchain fa4dd1f19bfeb3fd235dc7f1406c42404436bef5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fa4dd1f19bfeb3fd235dc7f1406c42404436bef5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/emersonmde/maybe 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" "+fa4dd1f19bfeb3fd235dc7f1406c42404436bef5" "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-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+fa4dd1f19bfeb3fd235dc7f1406c42404436bef5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2642387217a0debad2672b1753932ec36c26bb36bae111c0e34bf44670014c2f
[INFO] running `Command { std: "docker" "start" "-a" "2642387217a0debad2672b1753932ec36c26bb36bae111c0e34bf44670014c2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2642387217a0debad2672b1753932ec36c26bb36bae111c0e34bf44670014c2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2642387217a0debad2672b1753932ec36c26bb36bae111c0e34bf44670014c2f", kill_on_drop: false }`
[INFO] [stdout] 2642387217a0debad2672b1753932ec36c26bb36bae111c0e34bf44670014c2f
[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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+fa4dd1f19bfeb3fd235dc7f1406c42404436bef5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 19c33628ad8266e124073c915387420247594b1915410c9475446d05eafda03d
[INFO] running `Command { std: "docker" "start" "-a" "19c33628ad8266e124073c915387420247594b1915410c9475446d05eafda03d", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]     Checking cpufeatures v0.2.5
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking generic-array v0.14.6
[INFO] [stderr]     Checking block-buffer v0.10.3
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.6
[INFO] [stderr]     Checking sha2 v0.10.6
[INFO] [stderr]     Checking maybe v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `Branch` is never constructed
[INFO] [stdout]   --> src/node.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout]  6 | pub enum Node {
[INFO] [stdout]    |          ---- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 11 |     Branch {
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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: variant `Branch` is never constructed
[INFO] [stdout]   --> src/node.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout]  6 | pub enum Node {
[INFO] [stdout]    |          ---- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 11 |     Branch {
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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 2.98s
[INFO] running `Command { std: "docker" "inspect" "19c33628ad8266e124073c915387420247594b1915410c9475446d05eafda03d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19c33628ad8266e124073c915387420247594b1915410c9475446d05eafda03d", kill_on_drop: false }`
[INFO] [stdout] 19c33628ad8266e124073c915387420247594b1915410c9475446d05eafda03d