[INFO] fetching crate metacat 0.2.1...
[INFO] checking metacat-0.2.1 against try#0611f7de057c584b8771102fde7aed6c70c71d3b for pr-146440
[INFO] extracting crate metacat 0.2.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate metacat 0.2.1
[INFO] finished tweaking crates.io crate metacat 0.2.1
[INFO] tweaked toml for crates.io crate metacat 0.2.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate metacat 0.2.1 on toolchain 0611f7de057c584b8771102fde7aed6c70c71d3b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate metacat 0.2.1 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" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c59e6f16feb4494305d8a2768b30f197b864482ef646a2d77c46e3851033451
[INFO] running `Command { std: "docker" "start" "-a" "2c59e6f16feb4494305d8a2768b30f197b864482ef646a2d77c46e3851033451", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c59e6f16feb4494305d8a2768b30f197b864482ef646a2d77c46e3851033451", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c59e6f16feb4494305d8a2768b30f197b864482ef646a2d77c46e3851033451", kill_on_drop: false }`
[INFO] [stdout] 2c59e6f16feb4494305d8a2768b30f197b864482ef646a2d77c46e3851033451
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8d7dc1f9d852f8dd18610ecdb42ab00cfe3a705f3b180149d199d4d2db10f7b
[INFO] running `Command { std: "docker" "start" "-a" "f8d7dc1f9d852f8dd18610ecdb42ab00cfe3a705f3b180149d199d4d2db10f7b", kill_on_drop: false }`
[INFO] [stderr]    Compiling pest_generator v2.8.6
[INFO] [stderr]     Checking open-hypergraphs v0.3.1
[INFO] [stderr]    Compiling pest_derive v2.8.6
[INFO] [stderr]     Checking hexpr v0.2.2
[INFO] [stderr]     Checking metacat v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: struct `DualSig` is never constructed
[INFO] [stdout]   --> src/dual.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub struct DualSig<S>(S);
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]    = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `DualSig` is never constructed
[INFO] [stdout]   --> src/dual.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub struct DualSig<S>(S);
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]    = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `metacat` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `metacat` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "f8d7dc1f9d852f8dd18610ecdb42ab00cfe3a705f3b180149d199d4d2db10f7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8d7dc1f9d852f8dd18610ecdb42ab00cfe3a705f3b180149d199d4d2db10f7b", kill_on_drop: false }`
[INFO] [stdout] f8d7dc1f9d852f8dd18610ecdb42ab00cfe3a705f3b180149d199d4d2db10f7b
