[INFO] fetching crate lang_tester 0.3.13...
[INFO] checking lang_tester-0.3.13 against beta for pr-78714
[INFO] extracting crate lang_tester 0.3.13 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate lang_tester 0.3.13 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 lang_tester 0.3.13
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate lang_tester 0.3.13
[INFO] tweaked toml for crates.io crate lang_tester 0.3.13 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate lang_tester 0.3.13 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", 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] 54dd3571ec7ff8f739d2945033f3139ea9843baaafe709b8eeb86df306361b18
[INFO] running `Command { std: "docker" "start" "-a" "54dd3571ec7ff8f739d2945033f3139ea9843baaafe709b8eeb86df306361b18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "54dd3571ec7ff8f739d2945033f3139ea9843baaafe709b8eeb86df306361b18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54dd3571ec7ff8f739d2945033f3139ea9843baaafe709b8eeb86df306361b18", kill_on_drop: false }`
[INFO] [stdout] 54dd3571ec7ff8f739d2945033f3139ea9843baaafe709b8eeb86df306361b18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87b4fbcff94f4b554be0a27065fc40e0396e2881132a74c9ccd6ef76364a0d4f
[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" "87b4fbcff94f4b554be0a27065fc40e0396e2881132a74c9ccd6ef76364a0d4f", kill_on_drop: false }`
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking fm v0.1.4
[INFO] [stderr]     Checking lang_tester v0.3.13 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "87b4fbcff94f4b554be0a27065fc40e0396e2881132a74c9ccd6ef76364a0d4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87b4fbcff94f4b554be0a27065fc40e0396e2881132a74c9ccd6ef76364a0d4f", kill_on_drop: false }`
[INFO] [stdout] 87b4fbcff94f4b554be0a27065fc40e0396e2881132a74c9ccd6ef76364a0d4f