[INFO] fetching crate qmc 2.19.1...
[INFO] checking qmc-2.19.1 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate qmc 2.19.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate qmc 2.19.1 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate qmc 2.19.1
[INFO] finished tweaking crates.io crate qmc 2.19.1
[INFO] tweaked toml for crates.io crate qmc 2.19.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate qmc 2.19.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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] 75edb3bc55494ed4c48a94dbe6303bf489c2a60af063cce039c98fedd94cd53c
[INFO] running `Command { std: "docker" "start" "-a" "75edb3bc55494ed4c48a94dbe6303bf489c2a60af063cce039c98fedd94cd53c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75edb3bc55494ed4c48a94dbe6303bf489c2a60af063cce039c98fedd94cd53c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75edb3bc55494ed4c48a94dbe6303bf489c2a60af063cce039c98fedd94cd53c", kill_on_drop: false }`
[INFO] [stdout] 75edb3bc55494ed4c48a94dbe6303bf489c2a60af063cce039c98fedd94cd53c
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ae851f842395e9cecfa1f147f92c0fe4e1957091da8cec004afe63d8b15224a
[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" "9ae851f842395e9cecfa1f147f92c0fe4e1957091da8cec004afe63d8b15224a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking qmc v2.19.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `min`
[INFO] [stdout]  --> src/classical/graph.rs:4:21
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cmp::{max, min};
[INFO] [stdout]   |                     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `rand_isaac`
[INFO] [stdout]   --> benches/end_to_end.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     use rand_isaac::Isaac64Rng;
[INFO] [stdout]    |         ^^^^^^^^^^ use of undeclared crate or module `rand_isaac`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `min`
[INFO] [stdout]  --> src/classical/graph.rs:4:21
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cmp::{max, min};
[INFO] [stdout]   |                     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[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 `qmc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9ae851f842395e9cecfa1f147f92c0fe4e1957091da8cec004afe63d8b15224a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ae851f842395e9cecfa1f147f92c0fe4e1957091da8cec004afe63d8b15224a", kill_on_drop: false }`
[INFO] [stdout] 9ae851f842395e9cecfa1f147f92c0fe4e1957091da8cec004afe63d8b15224a