[INFO] cloning repository https://github.com/nathanfaucett/rs-prng
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nathanfaucett/rs-prng" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnathanfaucett%2Frs-prng", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnathanfaucett%2Frs-prng'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ce17641082164b5b1567de0560576a2af3e28485
[INFO] testing nathanfaucett/rs-prng against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnathanfaucett%2Frs-prng" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nathanfaucett/rs-prng on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nathanfaucett/rs-prng
[INFO] finished tweaking git repo https://github.com/nathanfaucett/rs-prng
[INFO] tweaked toml for git repo https://github.com/nathanfaucett/rs-prng written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/nathanfaucett/rs-prng already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "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] 5313868a4877c72c1badd8857a88a0f3ec2aba6990a31c7e5ea2d81044b44ab4
[INFO] running `Command { std: "docker" "start" "-a" "5313868a4877c72c1badd8857a88a0f3ec2aba6990a31c7e5ea2d81044b44ab4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5313868a4877c72c1badd8857a88a0f3ec2aba6990a31c7e5ea2d81044b44ab4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5313868a4877c72c1badd8857a88a0f3ec2aba6990a31c7e5ea2d81044b44ab4", kill_on_drop: false }`
[INFO] [stdout] 5313868a4877c72c1badd8857a88a0f3ec2aba6990a31c7e5ea2d81044b44ab4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 857d2b04c6bc455af0c5c8163af7be53e0aa67f781665ec251147a1f1f3f4071
[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" "857d2b04c6bc455af0c5c8163af7be53e0aa67f781665ec251147a1f1f3f4071", kill_on_drop: false }`
[INFO] [stderr]    Compiling rng v0.1.0 (https://github.com/nathanfaucett/rs-rng.git#356735ea)
[INFO] [stderr]    Compiling prng v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `alloc::arc`
[INFO] [stdout]  --> src/atomic_prng.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use alloc::arc::Arc;
[INFO] [stdout]   |            ^^^ could not find `arc` in `alloc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `prng`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "857d2b04c6bc455af0c5c8163af7be53e0aa67f781665ec251147a1f1f3f4071", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "857d2b04c6bc455af0c5c8163af7be53e0aa67f781665ec251147a1f1f3f4071", kill_on_drop: false }`
[INFO] [stdout] 857d2b04c6bc455af0c5c8163af7be53e0aa67f781665ec251147a1f1f3f4071