[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] checking przprz/rust-playground against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprzprz%2Frust-playground" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/przprz/rust-playground on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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] a6ac748324951ef515604478ddb13220424376671247fc9dac2d0f182658d2fa
[INFO] running `Command { std: "docker" "start" "-a" "a6ac748324951ef515604478ddb13220424376671247fc9dac2d0f182658d2fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6ac748324951ef515604478ddb13220424376671247fc9dac2d0f182658d2fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6ac748324951ef515604478ddb13220424376671247fc9dac2d0f182658d2fa", kill_on_drop: false }`
[INFO] [stdout] a6ac748324951ef515604478ddb13220424376671247fc9dac2d0f182658d2fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89dde54d39bdd07f9e278c1eea55c62e1be8aa6619eeb1515094aac3a84e86d9
[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" "89dde54d39bdd07f9e278c1eea55c62e1be8aa6619eeb1515094aac3a84e86d9", kill_on_drop: false }`
[INFO] [stderr]     Checking 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: 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] [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 0.29s
[INFO] running `Command { std: "docker" "inspect" "89dde54d39bdd07f9e278c1eea55c62e1be8aa6619eeb1515094aac3a84e86d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89dde54d39bdd07f9e278c1eea55c62e1be8aa6619eeb1515094aac3a84e86d9", kill_on_drop: false }`
[INFO] [stdout] 89dde54d39bdd07f9e278c1eea55c62e1be8aa6619eeb1515094aac3a84e86d9