[INFO] cloning repository https://github.com/LironHazan/rusty-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LironHazan/rusty-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLironHazan%2Frusty-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLironHazan%2Frusty-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5d4231ec3716e4229c064f306e66030e78d3bfd4
[INFO] checking LironHazan/rusty-playground against beta-2020-07-24 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLironHazan%2Frusty-playground" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LironHazan/rusty-playground 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/LironHazan/rusty-playground
[INFO] finished tweaking git repo https://github.com/LironHazan/rusty-playground
[INFO] tweaked toml for git repo https://github.com/LironHazan/rusty-playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/LironHazan/rusty-playground 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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] a7df61f84aaaaaed2eb20459fce8837ae168d873706093cd9ec04dbe0b323959
[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" "a7df61f84aaaaaed2eb20459fce8837ae168d873706093cd9ec04dbe0b323959", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7df61f84aaaaaed2eb20459fce8837ae168d873706093cd9ec04dbe0b323959", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7df61f84aaaaaed2eb20459fce8837ae168d873706093cd9ec04dbe0b323959", kill_on_drop: false }`
[INFO] [stdout] a7df61f84aaaaaed2eb20459fce8837ae168d873706093cd9ec04dbe0b323959
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9c9b9e96f8adde6185fb8bf10f5b6e45435db6cf2426aa24e3cb5db751a34a9
[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" "e9c9b9e96f8adde6185fb8bf10f5b6e45435db6cf2426aa24e3cb5db751a34a9", kill_on_drop: false }`
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rusty-playgraound v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::random`
[INFO] [stdout]   --> src/basics.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     use rand::random;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::random`
[INFO] [stdout]   --> src/basics.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     use rand::random;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `foo`
[INFO] [stdout]   --> src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for foo in ll { // LinkedList implements iterator
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_foo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `biss`
[INFO] [stdout]   --> src/structs_and_enums.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let biss = Animal::Dog;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_biss`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chuk`
[INFO] [stdout]   --> src/structs_and_enums.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let chuk = Animal::Cat;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_chuk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_ownwership_sum`
[INFO] [stdout]  --> src/borrows.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn take_ownwership_sum(v: Vec<i32>) -> i32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dog`
[INFO] [stdout]   --> src/structs_and_enums.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Dog,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cat`
[INFO] [stdout]   --> src/structs_and_enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Cat,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cow`
[INFO] [stdout]   --> src/structs_and_enums.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Cow,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Other`
[INFO] [stdout]   --> src/structs_and_enums.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Other(u32)
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Baz`
[INFO] [stdout]   --> src/structs_and_enums.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Baz {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_sound`
[INFO] [stdout]   --> src/structs_and_enums.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn make_sound() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `foo`
[INFO] [stdout]   --> src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for foo in ll { // LinkedList implements iterator
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_foo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `biss`
[INFO] [stdout]   --> src/structs_and_enums.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let biss = Animal::Dog;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_biss`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chuk`
[INFO] [stdout]   --> src/structs_and_enums.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let chuk = Animal::Cat;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_chuk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_ownwership_sum`
[INFO] [stdout]  --> src/borrows.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn take_ownwership_sum(v: Vec<i32>) -> i32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dog`
[INFO] [stdout]   --> src/structs_and_enums.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Dog,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cat`
[INFO] [stdout]   --> src/structs_and_enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Cat,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cow`
[INFO] [stdout]   --> src/structs_and_enums.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Cow,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Other`
[INFO] [stdout]   --> src/structs_and_enums.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Other(u32)
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Baz`
[INFO] [stdout]   --> src/structs_and_enums.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Baz {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_sound`
[INFO] [stdout]   --> src/structs_and_enums.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn make_sound() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.20s
[INFO] running `Command { std: "docker" "inspect" "e9c9b9e96f8adde6185fb8bf10f5b6e45435db6cf2426aa24e3cb5db751a34a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9c9b9e96f8adde6185fb8bf10f5b6e45435db6cf2426aa24e3cb5db751a34a9", kill_on_drop: false }`
[INFO] [stdout] e9c9b9e96f8adde6185fb8bf10f5b6e45435db6cf2426aa24e3cb5db751a34a9
