[INFO] crate permu-rs 0.1.4 is already in cache
[INFO] checking permu-rs-0.1.4 against try#e922e6444795ab795fab1943288aee3d543699b8 for pr-66852
[INFO] extracting crate permu-rs 0.1.4 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate permu-rs 0.1.4 on toolchain e922e6444795ab795fab1943288aee3d543699b8
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e922e6444795ab795fab1943288aee3d543699b8" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate permu-rs 0.1.4
[INFO] finished tweaking crates.io crate permu-rs 0.1.4
[INFO] tweaked toml for crates.io crate permu-rs 0.1.4 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e922e6444795ab795fab1943288aee3d543699b8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e922e6444795ab795fab1943288aee3d543699b8" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "/opt/rustwide/cargo-home/bin/cargo" "+e922e6444795ab795fab1943288aee3d543699b8" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 23d847ab27d8d5c1a16d4651e78f69b6ff85c31acef45a50b8f09b2abc6dbd20
[INFO] running `"docker" "start" "-a" "23d847ab27d8d5c1a16d4651e78f69b6ff85c31acef45a50b8f09b2abc6dbd20"`
[INFO] [stderr]     Checking permu-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `VjPopulation`
[INFO] [stderr]  --> src/permutation.rs:8:21
[INFO] [stderr]   |
[INFO] [stderr] 8 | use crate::vj::{Vj, VjPopulation};
[INFO] [stderr]   |                     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/vj.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `VjPopulation`
[INFO] [stderr]  --> src/permutation.rs:8:21
[INFO] [stderr]   |
[INFO] [stderr] 8 | use crate::vj::{Vj, VjPopulation};
[INFO] [stderr]   |                     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/vj.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> benches/bench.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut distr = pop.learn();
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> benches/bench.rs:20:10
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let (mut distr, mut samples) = data; 
[INFO] [stderr]    |          ----^^^^^
[INFO] [stderr]    |          |
[INFO] [stderr]    |          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> benches/bench.rs:20:21
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let (mut distr, mut samples) = data; 
[INFO] [stderr]    |                     ----^^^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> benches/bench.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     Population::sample(distr, samples);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.73s
[INFO] running `"docker" "inspect" "23d847ab27d8d5c1a16d4651e78f69b6ff85c31acef45a50b8f09b2abc6dbd20"`
[INFO] running `"docker" "rm" "-f" "23d847ab27d8d5c1a16d4651e78f69b6ff85c31acef45a50b8f09b2abc6dbd20"`
[INFO] [stdout] 23d847ab27d8d5c1a16d4651e78f69b6ff85c31acef45a50b8f09b2abc6dbd20