[INFO] fetching crate im-rc 15.0.0...
[INFO] checking im-rc-15.0.0 against beta for pr-78714
[INFO] extracting crate im-rc 15.0.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate im-rc 15.0.0 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 im-rc 15.0.0
[INFO] finished tweaking crates.io crate im-rc 15.0.0
[INFO] tweaked toml for crates.io crate im-rc 15.0.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] f73fd5976962dea60eebeaecda4dd607bbf4e707f9bef272b6da430c1f917d66
[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" "f73fd5976962dea60eebeaecda4dd607bbf4e707f9bef272b6da430c1f917d66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f73fd5976962dea60eebeaecda4dd607bbf4e707f9bef272b6da430c1f917d66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f73fd5976962dea60eebeaecda4dd607bbf4e707f9bef272b6da430c1f917d66", kill_on_drop: false }`
[INFO] [stdout] f73fd5976962dea60eebeaecda4dd607bbf4e707f9bef272b6da430c1f917d66
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stdout] b12fbe9e0d209cae3b956540a083b840639da32c9725718a436d5b0aebe6f928
[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" "b12fbe9e0d209cae3b956540a083b840639da32c9725718a436d5b0aebe6f928", kill_on_drop: false }`
[INFO] [stderr]     Checking metrohash v1.0.6
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling im-rc v15.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bitmaps v2.1.0
[INFO] [stderr]     Checking rand_xoshiro v0.4.0
[INFO] [stderr]    Compiling proptest-derive v0.1.2
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking rusty-fork v0.2.2
[INFO] [stderr]     Checking proptest v0.9.6
[INFO] [stderr]     Checking sized-chunks v0.6.2
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/vector/mod.rs:986:13
[INFO] [stdout]     |
[INFO] [stdout] 986 |             replace(self, other);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/vector/mod.rs:986:13
[INFO] [stdout]     |
[INFO] [stdout] 986 |             replace(self, other);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.91s
[INFO] running `Command { std: "docker" "inspect" "b12fbe9e0d209cae3b956540a083b840639da32c9725718a436d5b0aebe6f928", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b12fbe9e0d209cae3b956540a083b840639da32c9725718a436d5b0aebe6f928", kill_on_drop: false }`
[INFO] [stdout] b12fbe9e0d209cae3b956540a083b840639da32c9725718a436d5b0aebe6f928