[INFO] cloning repository https://github.com/BarlowDu/rust-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BarlowDu/rust-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBarlowDu%2Frust-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBarlowDu%2Frust-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d8333c5e60bebec05b21a9de1be9277c76830a52
[INFO] checking BarlowDu/rust-lang against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBarlowDu%2Frust-lang" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BarlowDu/rust-lang on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BarlowDu/rust-lang
[INFO] finished tweaking git repo https://github.com/BarlowDu/rust-lang
[INFO] tweaked toml for git repo https://github.com/BarlowDu/rust-lang written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/BarlowDu/rust-lang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b99a4a60309c40e5fc207460730ab95d84ad2318c5df2a0740ad50e8b5488d9c
[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" "b99a4a60309c40e5fc207460730ab95d84ad2318c5df2a0740ad50e8b5488d9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b99a4a60309c40e5fc207460730ab95d84ad2318c5df2a0740ad50e8b5488d9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b99a4a60309c40e5fc207460730ab95d84ad2318c5df2a0740ad50e8b5488d9c", kill_on_drop: false }`
[INFO] [stdout] b99a4a60309c40e5fc207460730ab95d84ad2318c5df2a0740ad50e8b5488d9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ea9320787d32fa1d5dc9aa83c45706ce1e0ef466d9d9f1ebe7394b65f8f347f
[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" "4ea9320787d32fa1d5dc9aa83c45706ce1e0ef466d9d9f1ebe7394b65f8f347f", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/module/ienum.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Ok(t)=>println!("result match t"),
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/module/ienum.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         Err(e)=>println!("result match none")
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/module/ienum.rs:33:14
[INFO] [stdout]    |
[INFO] [stdout] 33 |         Some(t)=>println!("option match t"),
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/module/iborrow.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let mut s=String::from("rust language");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> src/module/ilifetime.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     id:i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/module/ilifetime.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     name:&'a str
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/module/ienum.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Ok(t)=>println!("result match t"),
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/module/ienum.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         Err(e)=>println!("result match none")
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/module/ienum.rs:33:14
[INFO] [stdout]    |
[INFO] [stdout] 33 |         Some(t)=>println!("option match t"),
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/module/iborrow.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let mut s=String::from("rust language");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> src/module/ilifetime.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     id:i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/module/ilifetime.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     name:&'a str
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "4ea9320787d32fa1d5dc9aa83c45706ce1e0ef466d9d9f1ebe7394b65f8f347f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ea9320787d32fa1d5dc9aa83c45706ce1e0ef466d9d9f1ebe7394b65f8f347f", kill_on_drop: false }`
[INFO] [stdout] 4ea9320787d32fa1d5dc9aa83c45706ce1e0ef466d9d9f1ebe7394b65f8f347f