[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 master#cf79d034aa3d8f396d407aafce6f1ccd818e710e for pr-155657-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprzprz%2Frust-playground" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[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-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/przprz/rust-playground on toolchain cf79d034aa3d8f396d407aafce6f1ccd818e710e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/przprz/rust-playground 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" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2a8f9e06b95887c99aa28076690e9335f3613f38bb6faf8b42bbe361edc7bcb1
[INFO] running `Command { std: "docker" "start" "-a" "2a8f9e06b95887c99aa28076690e9335f3613f38bb6faf8b42bbe361edc7bcb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a8f9e06b95887c99aa28076690e9335f3613f38bb6faf8b42bbe361edc7bcb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a8f9e06b95887c99aa28076690e9335f3613f38bb6faf8b42bbe361edc7bcb1", kill_on_drop: false }`
[INFO] [stdout] 2a8f9e06b95887c99aa28076690e9335f3613f38bb6faf8b42bbe361edc7bcb1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a3a9cff8e30dc4c0980ce06c8c061f9637483ba4e6da1144d1edc7cf5fc43e94
[INFO] running `Command { std: "docker" "start" "-a" "a3a9cff8e30dc4c0980ce06c8c061f9637483ba4e6da1144d1edc7cf5fc43e94", 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)]` (part of `#[warn(unused)]`) 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 `Foo` is never constructed
[INFO] [stdout]  --> src/functions.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Foo;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bar` is never constructed
[INFO] [stdout]  --> src/functions.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Bar;
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]  --> src/functions.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Foo {
[INFO] [stdout]   | -------- method in this implementation
[INFO] [stdout] 7 |     fn bar(&self) {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]   --> src/functions.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Bar {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] 13 |     fn bar(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]   --> src/functions.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn f() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Thhh` is never constructed
[INFO] [stdout]  --> src/threads.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Thhh;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t` is never used
[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: enum `T` is never used
[INFO] [stdout]  --> src/q.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum T {
[INFO] [stdout]   |      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `C` is never constructed
[INFO] [stdout]  --> src/q.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct C {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `q` is never used
[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 `use_c` is never used
[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: struct `P` is never constructed
[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: trait `Magnify` is never used
[INFO] [stdout]  --> src/traits.rs:1:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub(crate) trait Magnify {
[INFO] [stdout]   |                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Slide` is never used
[INFO] [stdout]   --> src/traits.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub(crate) trait Slide<T, U> {
[INFO] [stdout]    |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mountain` is never constructed
[INFO] [stdout]   --> src/traits.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Mountain {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/traits.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl Mountain {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 31 |     pub fn new() -> Self {
[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)]` (part of `#[warn(unused)]`) 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 `Foo` is never constructed
[INFO] [stdout]  --> src/functions.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Foo;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bar` is never constructed
[INFO] [stdout]  --> src/functions.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Bar;
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]  --> src/functions.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Foo {
[INFO] [stdout]   | -------- method in this implementation
[INFO] [stdout] 7 |     fn bar(&self) {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bar` is never used
[INFO] [stdout]   --> src/functions.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Bar {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] 13 |     fn bar(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]   --> src/functions.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn f() {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Thhh` is never constructed
[INFO] [stdout]  --> src/threads.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Thhh;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t` is never used
[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: enum `T` is never used
[INFO] [stdout]  --> src/q.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum T {
[INFO] [stdout]   |      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `C` is never constructed
[INFO] [stdout]  --> src/q.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct C {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `q` is never used
[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 `use_c` is never used
[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: struct `P` is never constructed
[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: trait `Magnify` is never used
[INFO] [stdout]  --> src/traits.rs:1:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub(crate) trait Magnify {
[INFO] [stdout]   |                  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Slide` is never used
[INFO] [stdout]   --> src/traits.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub(crate) trait Slide<T, U> {
[INFO] [stdout]    |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mountain` is never constructed
[INFO] [stdout]   --> src/traits.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Mountain {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/traits.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl Mountain {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 31 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "a3a9cff8e30dc4c0980ce06c8c061f9637483ba4e6da1144d1edc7cf5fc43e94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3a9cff8e30dc4c0980ce06c8c061f9637483ba4e6da1144d1edc7cf5fc43e94", kill_on_drop: false }`
[INFO] [stdout] a3a9cff8e30dc4c0980ce06c8c061f9637483ba4e6da1144d1edc7cf5fc43e94
