[INFO] fetching crate idlset 0.1.10...
[INFO] checking idlset-0.1.10 against beta for pr-78714
[INFO] extracting crate idlset 0.1.10 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate idlset 0.1.10 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate idlset 0.1.10
[INFO] finished tweaking crates.io crate idlset 0.1.10
[INFO] tweaked toml for crates.io crate idlset 0.1.10 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate idlset 0.1.10 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa4293d35235a31fa2bc197f1971148e8ad730616d9c8b87ed8c3887abaf2715
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "aa4293d35235a31fa2bc197f1971148e8ad730616d9c8b87ed8c3887abaf2715", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa4293d35235a31fa2bc197f1971148e8ad730616d9c8b87ed8c3887abaf2715", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa4293d35235a31fa2bc197f1971148e8ad730616d9c8b87ed8c3887abaf2715", kill_on_drop: false }`
[INFO] [stdout] aa4293d35235a31fa2bc197f1971148e8ad730616d9c8b87ed8c3887abaf2715
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1f1248f633c85f93254a67fc78f8fcde2ef1b465844457a63fe24a86f30e159a
[INFO] running `Command { std: "docker" "start" "-a" "1f1248f633c85f93254a67fc78f8fcde2ef1b465844457a63fe24a86f30e159a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.40
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling standback v0.2.10
[INFO] [stderr]    Compiling time v0.2.17
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]     Checking time-macros v0.1.0
[INFO] [stderr]     Checking idlset v0.1.10 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> src/idl_simple.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> src/idl_simple.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn len(&self) -> 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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.28s
[INFO] running `Command { std: "docker" "inspect" "1f1248f633c85f93254a67fc78f8fcde2ef1b465844457a63fe24a86f30e159a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f1248f633c85f93254a67fc78f8fcde2ef1b465844457a63fe24a86f30e159a", kill_on_drop: false }`
[INFO] [stdout] 1f1248f633c85f93254a67fc78f8fcde2ef1b465844457a63fe24a86f30e159a