[INFO] cloning repository https://github.com/Qi-Zhan/FlashFill
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Qi-Zhan/FlashFill" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQi-Zhan%2FFlashFill", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQi-Zhan%2FFlashFill'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2240540b2a45906fe86bd593d674bcbd175fa676
[INFO] checking Qi-Zhan/FlashFill/2240540b2a45906fe86bd593d674bcbd175fa676 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQi-Zhan%2FFlashFill" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Qi-Zhan/FlashFill on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Qi-Zhan/FlashFill
[INFO] finished tweaking git repo https://github.com/Qi-Zhan/FlashFill
[INFO] tweaked toml for git repo https://github.com/Qi-Zhan/FlashFill written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Qi-Zhan/FlashFill 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bcfb5000447b944de2117339ac5201da2c4595743e72e018f138a386ba330fbc
[INFO] running `Command { std: "docker" "start" "-a" "bcfb5000447b944de2117339ac5201da2c4595743e72e018f138a386ba330fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bcfb5000447b944de2117339ac5201da2c4595743e72e018f138a386ba330fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bcfb5000447b944de2117339ac5201da2c4595743e72e018f138a386ba330fbc", kill_on_drop: false }`
[INFO] [stdout] bcfb5000447b944de2117339ac5201da2c4595743e72e018f138a386ba330fbc
[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 -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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a725dea69936956e3d072a4ddaaf685055cd35ffea8b80650ec3dbadb91c5eca
[INFO] running `Command { std: "docker" "start" "-a" "a725dea69936956e3d072a4ddaaf685055cd35ffea8b80650ec3dbadb91c5eca", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.10.0
[INFO] [stderr]     Checking itertools v0.12.1
[INFO] [stderr]     Checking flashfill v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `nodes` is never read
[INFO] [stdout]   --> src/data_structure.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Dag {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 38 |     pub nodes: HashSet<Node>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dag` 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 `nodes` is never read
[INFO] [stdout]   --> src/data_structure.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Dag {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 38 |     pub nodes: HashSet<Node>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dag` 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 2.21s
[INFO] running `Command { std: "docker" "inspect" "a725dea69936956e3d072a4ddaaf685055cd35ffea8b80650ec3dbadb91c5eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a725dea69936956e3d072a4ddaaf685055cd35ffea8b80650ec3dbadb91c5eca", kill_on_drop: false }`
[INFO] [stdout] a725dea69936956e3d072a4ddaaf685055cd35ffea8b80650ec3dbadb91c5eca