[INFO] fetching crate wordtop 0.1.6...
[INFO] building wordtop-0.1.6 against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237-1
[INFO] extracting crate wordtop 0.1.6 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate wordtop 0.1.6
[INFO] finished tweaking crates.io crate wordtop 0.1.6
[INFO] tweaked toml for crates.io crate wordtop 0.1.6 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate wordtop 0.1.6 on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate wordtop 0.1.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ctrlc v3.2.1
[INFO] [stderr]   Downloaded nix v0.23.0
[INFO] [stderr]   Downloaded libc v0.2.108
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74170856e21606f3b8a2413fcc8457788f9ad1eb3c4dc2c3c12071998a3bb2d0
[INFO] running `Command { std: "docker" "start" "-a" "74170856e21606f3b8a2413fcc8457788f9ad1eb3c4dc2c3c12071998a3bb2d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74170856e21606f3b8a2413fcc8457788f9ad1eb3c4dc2c3c12071998a3bb2d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74170856e21606f3b8a2413fcc8457788f9ad1eb3c4dc2c3c12071998a3bb2d0", kill_on_drop: false }`
[INFO] [stdout] 74170856e21606f3b8a2413fcc8457788f9ad1eb3c4dc2c3c12071998a3bb2d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec4e4b01805222a463711e4940d232016af0bf70d7c140e76f4f0c2049db2bc3
[INFO] running `Command { std: "docker" "start" "-a" "ec4e4b01805222a463711e4940d232016af0bf70d7c140e76f4f0c2049db2bc3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling nix v0.23.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling ctrlc v3.2.1
[INFO] [stderr]    Compiling wordtop v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `sorted_vec` is never read
[INFO] [stdout]   --> src/calculate.rs:86:17
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let mut sorted_vec = Vec::new();
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sorted_vec` is never read
[INFO] [stdout]    --> src/calculate.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut sorted_vec = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/print.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |                 count = 0;
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.27s
[INFO] running `Command { std: "docker" "inspect" "ec4e4b01805222a463711e4940d232016af0bf70d7c140e76f4f0c2049db2bc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec4e4b01805222a463711e4940d232016af0bf70d7c140e76f4f0c2049db2bc3", kill_on_drop: false }`
[INFO] [stdout] ec4e4b01805222a463711e4940d232016af0bf70d7c140e76f4f0c2049db2bc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58e195d487e947aa3d6ae570459abfb2711e554440b295dc08e04df6b1f3e3ef
[INFO] running `Command { std: "docker" "start" "-a" "58e195d487e947aa3d6ae570459abfb2711e554440b295dc08e04df6b1f3e3ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling wordtop v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `sorted_vec` is never read
[INFO] [stdout]   --> src/calculate.rs:86:17
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let mut sorted_vec = Vec::new();
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sorted_vec` is never read
[INFO] [stdout]    --> src/calculate.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut sorted_vec = Vec::new();
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/print.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |                 count = 0;
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/print.rs:76:18
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let (mut k, mut t) = print_stats(&x, 10, 10);
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/print.rs:76:25
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let (mut k, mut t) = print_stats(&x, 10, 10);
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/print.rs:76:14
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let (mut k, mut t) = print_stats(&x, 10, 10);
[INFO] [stdout]    |              ----^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/print.rs:76:21
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let (mut k, mut t) = print_stats(&x, 10, 10);
[INFO] [stdout]    |                     ----^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "58e195d487e947aa3d6ae570459abfb2711e554440b295dc08e04df6b1f3e3ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58e195d487e947aa3d6ae570459abfb2711e554440b295dc08e04df6b1f3e3ef", kill_on_drop: false }`
[INFO] [stdout] 58e195d487e947aa3d6ae570459abfb2711e554440b295dc08e04df6b1f3e3ef