[INFO] cloning repository https://github.com/przprz/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/przprz/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprzprz%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprzprz%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] da07dd27a84aeb4db9290bcb3d7a18d25b5ee897
[INFO] testing przprz/rust-playground against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprzprz%2Frust-playground" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/przprz/rust-playground on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/przprz/rust-playground
[INFO] finished tweaking git repo https://github.com/przprz/rust-playground
[INFO] tweaked toml for git repo https://github.com/przprz/rust-playground written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/przprz/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8327596f4a6c37e4c3687d77da9291517ea5890955c2b63c8d5609e78cf7eb0c
[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" "8327596f4a6c37e4c3687d77da9291517ea5890955c2b63c8d5609e78cf7eb0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8327596f4a6c37e4c3687d77da9291517ea5890955c2b63c8d5609e78cf7eb0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8327596f4a6c37e4c3687d77da9291517ea5890955c2b63c8d5609e78cf7eb0c", kill_on_drop: false }`
[INFO] [stdout] 8327596f4a6c37e4c3687d77da9291517ea5890955c2b63c8d5609e78cf7eb0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "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] 1456c568af12434a655da366622a8a086f47a83c4b0e67ad0bdcadebc2cc6b45
[INFO] running `Command { std: "docker" "start" "-a" "1456c568af12434a655da366622a8a086f47a83c4b0e67ad0bdcadebc2cc6b45", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `traits::Magnify`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use traits::Magnify;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `traits::Mountain`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use traits::Mountain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Bar`
[INFO] [stdout]  --> src/functions.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Bar;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `bar`
[INFO] [stdout]  --> src/functions.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn bar(&self) {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `bar`
[INFO] [stdout]   --> src/functions.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn bar(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]   --> src/functions.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn f() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `t`
[INFO] [stdout]  --> src/threads.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub(crate) fn t() {
[INFO] [stdout]   |               ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `P`
[INFO] [stdout]  --> src/q/p.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct P;
[INFO] [stdout]   |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `First`
[INFO] [stdout]  --> src/q.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     First,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Second`
[INFO] [stdout]  --> src/q.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Second,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `C`
[INFO] [stdout]  --> src/q.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct C {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `q`
[INFO] [stdout]   --> src/q.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn q() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_c`
[INFO] [stdout]   --> src/q.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn use_c(c: &C) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/traits.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     height: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/traits.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.98s
[INFO] running `Command { std: "docker" "inspect" "1456c568af12434a655da366622a8a086f47a83c4b0e67ad0bdcadebc2cc6b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1456c568af12434a655da366622a8a086f47a83c4b0e67ad0bdcadebc2cc6b45", kill_on_drop: false }`
[INFO] [stdout] 1456c568af12434a655da366622a8a086f47a83c4b0e67ad0bdcadebc2cc6b45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b9e880597b76192f930f998b227d76d1109f5d787ddf2bdea99cea3e80cd316
[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" "9b9e880597b76192f930f998b227d76d1109f5d787ddf2bdea99cea3e80cd316", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `traits::Magnify`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use traits::Magnify;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `traits::Mountain`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use traits::Mountain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Bar`
[INFO] [stdout]  --> src/functions.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Bar;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `bar`
[INFO] [stdout]  --> src/functions.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn bar(&self) {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `bar`
[INFO] [stdout]   --> src/functions.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn bar(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]   --> src/functions.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn f() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `t`
[INFO] [stdout]  --> src/threads.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub(crate) fn t() {
[INFO] [stdout]   |               ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `P`
[INFO] [stdout]  --> src/q/p.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct P;
[INFO] [stdout]   |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `First`
[INFO] [stdout]  --> src/q.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     First,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Second`
[INFO] [stdout]  --> src/q.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Second,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `C`
[INFO] [stdout]  --> src/q.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct C {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `q`
[INFO] [stdout]   --> src/q.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn q() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_c`
[INFO] [stdout]   --> src/q.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn use_c(c: &C) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/traits.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     height: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/traits.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `Command { std: "docker" "inspect" "9b9e880597b76192f930f998b227d76d1109f5d787ddf2bdea99cea3e80cd316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b9e880597b76192f930f998b227d76d1109f5d787ddf2bdea99cea3e80cd316", kill_on_drop: false }`
[INFO] [stdout] 9b9e880597b76192f930f998b227d76d1109f5d787ddf2bdea99cea3e80cd316
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 656b05c0dd8de453adb6cb25359155bbd993a4e07498f3e7377c526dcd5aa3d4
[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" "656b05c0dd8de453adb6cb25359155bbd993a4e07498f3e7377c526dcd5aa3d4", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `traits::Magnify`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use traits::Magnify;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `traits::Mountain`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use traits::Mountain;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Bar`
[INFO] [stderr]  --> src/functions.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Bar;
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `bar`
[INFO] [stderr]  --> src/functions.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn bar(&self) {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `bar`
[INFO] [stderr]   --> src/functions.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn bar(&self) {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]   --> src/functions.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub fn f() {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `t`
[INFO] [stderr]  --> src/threads.rs:7:15
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub(crate) fn t() {
[INFO] [stderr]   |               ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `P`
[INFO] [stderr]  --> src/q/p.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub struct P;
[INFO] [stderr]   |            ^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `First`
[INFO] [stderr]  --> src/q.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     First,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Second`
[INFO] [stderr]  --> src/q.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     Second,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `C`
[INFO] [stderr]  --> src/q.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | struct C {
[INFO] [stderr]   |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `q`
[INFO] [stderr]   --> src/q.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn q() {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_c`
[INFO] [stderr]   --> src/q.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn use_c(c: &C) -> String {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]   --> src/traits.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     height: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/traits.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-playground` (bin "rust-playground" test) generated 15 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_playground-b28ce99b7fb6acf4)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "656b05c0dd8de453adb6cb25359155bbd993a4e07498f3e7377c526dcd5aa3d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "656b05c0dd8de453adb6cb25359155bbd993a4e07498f3e7377c526dcd5aa3d4", kill_on_drop: false }`
[INFO] [stdout] 656b05c0dd8de453adb6cb25359155bbd993a4e07498f3e7377c526dcd5aa3d4