[INFO] fetching crate wl-tools 0.0.0-alpha.3...
[INFO] checking wl-tools-0.0.0-alpha.3 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate wl-tools 0.0.0-alpha.3 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate wl-tools 0.0.0-alpha.3 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 crates.io crate wl-tools 0.0.0-alpha.3
[INFO] finished tweaking crates.io crate wl-tools 0.0.0-alpha.3
[INFO] tweaked toml for crates.io crate wl-tools 0.0.0-alpha.3 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.77)
[INFO] [stderr]       Adding test-case v2.2.2 (available: v3.3.1)
[INFO] [stderr]       Adding test-case-macros v2.2.2 (available: v3.3.1)
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] cdba18031a7b04a52beca704308112fe29879d9ed4fd225d22d2f33b8f88472f
[INFO] running `Command { std: "docker" "start" "-a" "cdba18031a7b04a52beca704308112fe29879d9ed4fd225d22d2f33b8f88472f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cdba18031a7b04a52beca704308112fe29879d9ed4fd225d22d2f33b8f88472f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdba18031a7b04a52beca704308112fe29879d9ed4fd225d22d2f33b8f88472f", kill_on_drop: false }`
[INFO] [stdout] cdba18031a7b04a52beca704308112fe29879d9ed4fd225d22d2f33b8f88472f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] c707efa303d6dc8448dad21fe701ff1376ca3cb55e766ce5168339f16a10b02d
[INFO] running `Command { std: "docker" "start" "-a" "c707efa303d6dc8448dad21fe701ff1376ca3cb55e766ce5168339f16a10b02d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking wl-tools v0.0.0-alpha.3 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stdout] warning: fields `char_lowercase` and `idx_range` are never read
[INFO] [stdout]    --> src/tree/word_char.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 203 | struct WordCharTreeEdge<'a, W> {
[INFO] [stdout]     |        ---------------- fields in this struct
[INFO] [stdout] 204 |     char_lowercase: char,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 205 |     idx_range: RangeInclusive<usize>,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling test-case-macros v2.2.2
[INFO] [stderr]     Checking test-case v2.2.2
[INFO] [stdout] warning: fields `char_lowercase` and `idx_range` are never read
[INFO] [stdout]    --> src/tree/word_char.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 203 | struct WordCharTreeEdge<'a, W> {
[INFO] [stdout]     |        ---------------- fields in this struct
[INFO] [stdout] 204 |     char_lowercase: char,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 205 |     idx_range: RangeInclusive<usize>,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.60s
[INFO] running `Command { std: "docker" "inspect" "c707efa303d6dc8448dad21fe701ff1376ca3cb55e766ce5168339f16a10b02d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c707efa303d6dc8448dad21fe701ff1376ca3cb55e766ce5168339f16a10b02d", kill_on_drop: false }`
[INFO] [stdout] c707efa303d6dc8448dad21fe701ff1376ca3cb55e766ce5168339f16a10b02d