[INFO] fetching crate proton-call 3.1.2...
[INFO] checking proton-call-3.1.2 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate proton-call 3.1.2 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate proton-call 3.1.2 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 proton-call 3.1.2
[INFO] finished tweaking crates.io crate proton-call 3.1.2
[INFO] tweaked toml for crates.io crate proton-call 3.1.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate proton-call 3.1.2 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] [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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 836540ca3f55e54ab6712840abe5f9d09d47fece914d66c1998de7b11b8506ca
[INFO] running `Command { std: "docker" "start" "-a" "836540ca3f55e54ab6712840abe5f9d09d47fece914d66c1998de7b11b8506ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "836540ca3f55e54ab6712840abe5f9d09d47fece914d66c1998de7b11b8506ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "836540ca3f55e54ab6712840abe5f9d09d47fece914d66c1998de7b11b8506ca", kill_on_drop: false }`
[INFO] [stdout] 836540ca3f55e54ab6712840abe5f9d09d47fece914d66c1998de7b11b8506ca
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b7055a5f661a1204d560858d11eec95b50971f0779a793d71b46652da47a00e
[INFO] running `Command { std: "docker" "start" "-a" "5b7055a5f661a1204d560858d11eec95b50971f0779a793d71b46652da47a00e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling serde_derive v1.0.132
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]     Checking jargon-args v0.2.5
[INFO] [stderr]     Checking lliw v0.2.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking proton-call v3.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `version` is never read
[INFO] [stdout]   --> src/runtime.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Runtime {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 16 |     version: RunTimeVersion,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Runtime` has a derived impl for the trait `Debug`, but this is 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: field `version` is never read
[INFO] [stdout]   --> src/runtime.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Runtime {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 16 |     version: RunTimeVersion,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Runtime` has a derived impl for the trait `Debug`, but this is 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.41s
[INFO] running `Command { std: "docker" "inspect" "5b7055a5f661a1204d560858d11eec95b50971f0779a793d71b46652da47a00e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b7055a5f661a1204d560858d11eec95b50971f0779a793d71b46652da47a00e", kill_on_drop: false }`
[INFO] [stdout] 5b7055a5f661a1204d560858d11eec95b50971f0779a793d71b46652da47a00e