[INFO] fetching crate tryagain 0.1.0...
[INFO] checking tryagain-0.1.0 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate tryagain 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate tryagain 0.1.0 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tryagain 0.1.0
[INFO] finished tweaking crates.io crate tryagain 0.1.0
[INFO] tweaked toml for crates.io crate tryagain 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 77 packages to latest compatible versions
[INFO] [stderr]       Adding async-channel v1.9.0 (available: v2.3.1)
[INFO] [stderr]       Adding event-listener v2.5.3 (available: v5.3.1)
[INFO] [stderr]       Adding linux-raw-sys v0.4.14 (available: v0.6.5)
[INFO] [stderr]       Adding windows-sys v0.52.0 (available: v0.59.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2ec71130bf77b119125b49cab934623f8945f252babb8af7ea8777a3caae2af
[INFO] running `Command { std: "docker" "start" "-a" "f2ec71130bf77b119125b49cab934623f8945f252babb8af7ea8777a3caae2af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2ec71130bf77b119125b49cab934623f8945f252babb8af7ea8777a3caae2af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2ec71130bf77b119125b49cab934623f8945f252babb8af7ea8777a3caae2af", kill_on_drop: false }`
[INFO] [stdout] f2ec71130bf77b119125b49cab934623f8945f252babb8af7ea8777a3caae2af
[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 -Dtail_expr_drop_order" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e43a81733c67250be1bbae05d715577a02b55a1291d79e02742d1f05df4d1e76
[INFO] running `Command { std: "docker" "start" "-a" "e43a81733c67250be1bbae05d715577a02b55a1291d79e02742d1f05df4d1e76", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]    Compiling pin-project-internal v1.1.5
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]     Checking tokio v1.40.0
[INFO] [stderr]     Checking pin-project v1.1.5
[INFO] [stderr]     Checking tryagain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `instant` is never read
[INFO] [stdout]   --> src/backoff.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct ExponentialBackoff {
[INFO] [stdout]    |            ------------------ field in this struct
[INFO] [stdout] 18 |     instant: Instant,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExponentialBackoff` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `instant` is never read
[INFO] [stdout]   --> src/backoff.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct ExponentialBackoff {
[INFO] [stdout]    |            ------------------ field in this struct
[INFO] [stdout] 18 |     instant: Instant,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExponentialBackoff` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 6.87s
[INFO] running `Command { std: "docker" "inspect" "e43a81733c67250be1bbae05d715577a02b55a1291d79e02742d1f05df4d1e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e43a81733c67250be1bbae05d715577a02b55a1291d79e02742d1f05df4d1e76", kill_on_drop: false }`
[INFO] [stdout] e43a81733c67250be1bbae05d715577a02b55a1291d79e02742d1f05df4d1e76