[INFO] updating cached repository https://github.com/chengli1986/571b
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5a313ccc0f20adc2291b9cc5f5361cc9b58ff892
[INFO] testing chengli1986/571b against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchengli1986%2F571b" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/chengli1986/571b on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/chengli1986/571b
[INFO] finished tweaking git repo https://github.com/chengli1986/571b
[INFO] tweaked toml for git repo https://github.com/chengli1986/571b written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/chengli1986/571b already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-10/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4243e9a69dc141dda523f1822b5f08deb069ca8045fb19a75251aa23a8d9f06a
[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" "4243e9a69dc141dda523f1822b5f08deb069ca8045fb19a75251aa23a8d9f06a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4243e9a69dc141dda523f1822b5f08deb069ca8045fb19a75251aa23a8d9f06a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4243e9a69dc141dda523f1822b5f08deb069ca8045fb19a75251aa23a8d9f06a", kill_on_drop: false }`
[INFO] [stdout] 4243e9a69dc141dda523f1822b5f08deb069ca8045fb19a75251aa23a8d9f06a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", 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] ea3717f1b9ea562acc8a3be45fa0e54fe1a6a7419f950968ef3905eb1c89aa85
[INFO] running `Command { std: "docker" "start" "-a" "ea3717f1b9ea562acc8a3be45fa0e54fe1a6a7419f950968ef3905eb1c89aa85", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling standback v0.2.9
[INFO] [stderr]    Compiling time v0.2.16
[INFO] [stderr]    Compiling mmap v0.1.1
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling time-macros v0.1.0
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]    Compiling COST v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::cmp::max`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::cmp::max;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/hilbert_curve.rs:32:18
[INFO] [stdout]    |
[INFO] [stdout] 32 |         for _ in (0..count) {
[INFO] [stdout]    |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:248:18
[INFO] [stdout]     |
[INFO] [stdout] 248 |         for x in (0u32..256) {
[INFO] [stdout]     |                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:249:22
[INFO] [stdout]     |
[INFO] [stdout] 249 |             for y in (0u32..256) {
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:271:18
[INFO] [stdout]     |
[INFO] [stdout] 271 |         for i in (0 .. 4) {
[INFO] [stdout]     |                  ^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:287:22
[INFO] [stdout]     |
[INFO] [stdout] 287 |         for log_s in (0u32 .. 4) {
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:310:22
[INFO] [stdout]     |
[INFO] [stdout] 310 |     for log_s_rev in (0 .. 32) {
[INFO] [stdout]     |                      ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:323:18
[INFO] [stdout]     |
[INFO] [stdout] 323 |     for log_s in (0 .. 32) {
[INFO] [stdout]     |                  ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:166:23
[INFO] [stdout]     |
[INFO] [stdout] 166 |     for _iteration in (0 .. 20) {
[INFO] [stdout]     |                       ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:168:21
[INFO] [stdout]     |
[INFO] [stdout] 168 |         for node in (0 .. nodes) {
[INFO] [stdout]     |                     ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:212:14
[INFO] [stdout]     |
[INFO] [stdout] 212 |     for i in (0 .. roots.len()) { if i as u32 != roots[i] { non_roots += 1; }}
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:237:14
[INFO] [stdout]     |
[INFO] [stdout] 237 |     for i in (0 .. label.len()) { if i as u32 != label[i] { non_roots += 1; }}
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `COST` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.86s
[INFO] running `Command { std: "docker" "inspect" "ea3717f1b9ea562acc8a3be45fa0e54fe1a6a7419f950968ef3905eb1c89aa85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea3717f1b9ea562acc8a3be45fa0e54fe1a6a7419f950968ef3905eb1c89aa85", kill_on_drop: false }`
[INFO] [stdout] ea3717f1b9ea562acc8a3be45fa0e54fe1a6a7419f950968ef3905eb1c89aa85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 664a2621c09ef36a7a56a6c378c5b13d9ba9e0c5a9866a6f8b500237659050d3
[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" "664a2621c09ef36a7a56a6c378c5b13d9ba9e0c5a9866a6f8b500237659050d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling COST v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::cmp::max`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::cmp::max;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/hilbert_curve.rs:32:18
[INFO] [stdout]    |
[INFO] [stdout] 32 |         for _ in (0..count) {
[INFO] [stdout]    |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:248:18
[INFO] [stdout]     |
[INFO] [stdout] 248 |         for x in (0u32..256) {
[INFO] [stdout]     |                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:249:22
[INFO] [stdout]     |
[INFO] [stdout] 249 |             for y in (0u32..256) {
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:271:18
[INFO] [stdout]     |
[INFO] [stdout] 271 |         for i in (0 .. 4) {
[INFO] [stdout]     |                  ^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:287:22
[INFO] [stdout]     |
[INFO] [stdout] 287 |         for log_s in (0u32 .. 4) {
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:310:22
[INFO] [stdout]     |
[INFO] [stdout] 310 |     for log_s_rev in (0 .. 32) {
[INFO] [stdout]     |                      ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/hilbert_curve.rs:323:18
[INFO] [stdout]     |
[INFO] [stdout] 323 |     for log_s in (0 .. 32) {
[INFO] [stdout]     |                  ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:166:23
[INFO] [stdout]     |
[INFO] [stdout] 166 |     for _iteration in (0 .. 20) {
[INFO] [stdout]     |                       ^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:168:21
[INFO] [stdout]     |
[INFO] [stdout] 168 |         for node in (0 .. nodes) {
[INFO] [stdout]     |                     ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:212:14
[INFO] [stdout]     |
[INFO] [stdout] 212 |     for i in (0 .. roots.len()) { if i as u32 != roots[i] { non_roots += 1; }}
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/main.rs:237:14
[INFO] [stdout]     |
[INFO] [stdout] 237 |     for i in (0 .. label.len()) { if i as u32 != label[i] { non_roots += 1; }}
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `COST` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.88s
[INFO] running `Command { std: "docker" "inspect" "664a2621c09ef36a7a56a6c378c5b13d9ba9e0c5a9866a6f8b500237659050d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "664a2621c09ef36a7a56a6c378c5b13d9ba9e0c5a9866a6f8b500237659050d3", kill_on_drop: false }`
[INFO] [stdout] 664a2621c09ef36a7a56a6c378c5b13d9ba9e0c5a9866a6f8b500237659050d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", 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] 577b62ec1b0c9097b109042920268a0c523bac53006f1aa38b6aa1082207699c
[INFO] running `Command { std: "docker" "start" "-a" "577b62ec1b0c9097b109042920268a0c523bac53006f1aa38b6aa1082207699c", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use std::cmp::max;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]   --> src/hilbert_curve.rs:32:18
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for _ in (0..count) {
[INFO] [stderr]    |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:248:18
[INFO] [stderr]     |
[INFO] [stderr] 248 |         for x in (0u32..256) {
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:249:22
[INFO] [stderr]     |
[INFO] [stderr] 249 |             for y in (0u32..256) {
[INFO] [stderr]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:271:18
[INFO] [stderr]     |
[INFO] [stderr] 271 |         for i in (0 .. 4) {
[INFO] [stderr]     |                  ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:287:22
[INFO] [stderr]     |
[INFO] [stderr] 287 |         for log_s in (0u32 .. 4) {
[INFO] [stderr]     |                      ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:310:22
[INFO] [stderr]     |
[INFO] [stderr] 310 |     for log_s_rev in (0 .. 32) {
[INFO] [stderr]     |                      ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/hilbert_curve.rs:323:18
[INFO] [stderr]     |
[INFO] [stderr] 323 |     for log_s in (0 .. 32) {
[INFO] [stderr]     |                  ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:166:23
[INFO] [stderr]     |
[INFO] [stderr] 166 |     for _iteration in (0 .. 20) {
[INFO] [stderr]     |                       ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:168:21
[INFO] [stderr]     |
[INFO] [stderr] 168 |         for node in (0 .. nodes) {
[INFO] [stderr]     |                     ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:212:14
[INFO] [stderr]     |
[INFO] [stderr] 212 |     for i in (0 .. roots.len()) { if i as u32 != roots[i] { non_roots += 1; }}
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]    --> src/main.rs:237:14
[INFO] [stderr]     |
[INFO] [stderr] 237 |     for i in (0 .. label.len()) { if i as u32 != label[i] { non_roots += 1; }}
[INFO] [stderr]     |              ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: crate `COST` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `cost`
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/COST-b7d89fc03baca02c
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test hilbert_curve::test_encode_decode ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "577b62ec1b0c9097b109042920268a0c523bac53006f1aa38b6aa1082207699c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "577b62ec1b0c9097b109042920268a0c523bac53006f1aa38b6aa1082207699c", kill_on_drop: false }`
[INFO] [stdout] 577b62ec1b0c9097b109042920268a0c523bac53006f1aa38b6aa1082207699c