[INFO] fetching crate bigs 0.2.3...
[INFO] testing bigs-0.2.3 against 1.55.0 for beta-1.56-1
[INFO] extracting crate bigs 0.2.3 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate bigs 0.2.3 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bigs 0.2.3
[INFO] finished tweaking crates.io crate bigs 0.2.3
[INFO] tweaked toml for crates.io crate bigs 0.2.3 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a919168e88d6cc109a6657cff4176e2ff5402ee84533dd7613f1d9e8ecfab9a2
[INFO] running `Command { std: "docker" "start" "-a" "a919168e88d6cc109a6657cff4176e2ff5402ee84533dd7613f1d9e8ecfab9a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a919168e88d6cc109a6657cff4176e2ff5402ee84533dd7613f1d9e8ecfab9a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a919168e88d6cc109a6657cff4176e2ff5402ee84533dd7613f1d9e8ecfab9a2", kill_on_drop: false }`
[INFO] [stdout] a919168e88d6cc109a6657cff4176e2ff5402ee84533dd7613f1d9e8ecfab9a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ee7555d48084eeb822a4f3b9527e916327dbbf38f50f21ce49e53d2789eea39b
[INFO] running `Command { std: "docker" "start" "-a" "ee7555d48084eeb822a4f3b9527e916327dbbf38f50f21ce49e53d2789eea39b", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling bigs v0.2.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.74s
[INFO] running `Command { std: "docker" "inspect" "ee7555d48084eeb822a4f3b9527e916327dbbf38f50f21ce49e53d2789eea39b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee7555d48084eeb822a4f3b9527e916327dbbf38f50f21ce49e53d2789eea39b", kill_on_drop: false }`
[INFO] [stdout] ee7555d48084eeb822a4f3b9527e916327dbbf38f50f21ce49e53d2789eea39b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 928a23e1318ddbd0dcf4149ad60c3e2563dd1206817eda18f337873472b91b27
[INFO] running `Command { std: "docker" "start" "-a" "928a23e1318ddbd0dcf4149ad60c3e2563dd1206817eda18f337873472b91b27", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling bigs v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `rand::rngs::SmallRng`
[INFO] [stdout]  --> tests/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand::rngs::SmallRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^ no `SmallRng` in `rngs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SeedableRng`
[INFO] [stdout]  --> tests/main.rs:3:29
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::{thread_rng, Rng, SeedableRng};
[INFO] [stdout]   |                             ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bigs` due to 2 previous errors
[INFO] [stdout] error[E0465]: multiple rlib candidates for `rand` found
[INFO] [stdout]  --> src/sampler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: candidate #1: /opt/rustwide/target/debug/deps/librand-18e16905690305ac.rlib
[INFO] [stdout]  --> src/sampler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] note: candidate #2: /opt/rustwide/target/debug/deps/librand-a2656c3d5e5127ba.rlib
[INFO] [stdout]  --> src/sampler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::seq::SliceRandom;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "928a23e1318ddbd0dcf4149ad60c3e2563dd1206817eda18f337873472b91b27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "928a23e1318ddbd0dcf4149ad60c3e2563dd1206817eda18f337873472b91b27", kill_on_drop: false }`
[INFO] [stdout] 928a23e1318ddbd0dcf4149ad60c3e2563dd1206817eda18f337873472b91b27