[INFO] cloning repository https://github.com/cassaundra/backlight
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cassaundra/backlight" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Fbacklight", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Fbacklight'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ac8c6029e1bb057ef2e7e05ce5e7057644a2bc46
[INFO] checking cassaundra/backlight against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Fbacklight" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cassaundra/backlight on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cassaundra/backlight
[INFO] finished tweaking git repo https://github.com/cassaundra/backlight
[INFO] tweaked toml for git repo https://github.com/cassaundra/backlight written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/cassaundra/backlight already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/cassaundra/launch-rs.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded scrap v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e653524031c51a225ca2a6a0630ed8ecea7e279459877657f1f50cbfb854061
[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" "1e653524031c51a225ca2a6a0630ed8ecea7e279459877657f1f50cbfb854061", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e653524031c51a225ca2a6a0630ed8ecea7e279459877657f1f50cbfb854061", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e653524031c51a225ca2a6a0630ed8ecea7e279459877657f1f50cbfb854061", kill_on_drop: false }`
[INFO] [stdout] 1e653524031c51a225ca2a6a0630ed8ecea7e279459877657f1f50cbfb854061
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34689c5d10f333c0be242c73a38b97bd4b2347c40bd83da701312e93ee25fb5d
[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" "34689c5d10f333c0be242c73a38b97bd4b2347c40bd83da701312e93ee25fb5d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling pkg-config v0.3.18
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking memalloc v0.1.0
[INFO] [stderr]    Compiling scrap v0.5.0
[INFO] [stderr]     Checking bitflags v0.3.3
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking block v0.1.6
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling alsa-sys v0.1.2
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking nix v0.9.0
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]    Compiling syn v1.0.46
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling palette v0.4.1
[INFO] [stderr]     Checking alsa v0.2.2
[INFO] [stderr]    Compiling palette_derive v0.4.1
[INFO] [stderr]     Checking midir v0.5.0
[INFO] [stderr]    Compiling structopt-derive v0.4.13
[INFO] [stderr]     Checking launchpad v1.0.0 (https://github.com/cassaundra/launch-rs.git#a912059d)
[INFO] [stderr]     Checking structopt v0.3.20
[INFO] [stderr]     Checking backlight v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 67  | /     loop {
[INFO] [stdout] 68  | |         let t_a = Instant::now();
[INFO] [stdout] 69  | |
[INFO] [stdout] 70  | |         let buffer = match capturer.frame() {
[INFO] [stdout] ...   |
[INFO] [stdout] 140 | |         thread::sleep(Duration::from_millis(60));
[INFO] [stdout] 141 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 142 | 
[INFO] [stdout] 143 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t_a`
[INFO] [stdout]   --> src/main.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let t_a = Instant::now();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_t_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t_b`
[INFO] [stdout]   --> src/main.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |         let t_b = Instant::now();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_t_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 67  | /     loop {
[INFO] [stdout] 68  | |         let t_a = Instant::now();
[INFO] [stdout] 69  | |
[INFO] [stdout] 70  | |         let buffer = match capturer.frame() {
[INFO] [stdout] ...   |
[INFO] [stdout] 140 | |         thread::sleep(Duration::from_millis(60));
[INFO] [stdout] 141 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 142 | 
[INFO] [stdout] 143 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t_a`
[INFO] [stdout]   --> src/main.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let t_a = Instant::now();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_t_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t_b`
[INFO] [stdout]   --> src/main.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |         let t_b = Instant::now();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_t_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 14s
[INFO] running `Command { std: "docker" "inspect" "34689c5d10f333c0be242c73a38b97bd4b2347c40bd83da701312e93ee25fb5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34689c5d10f333c0be242c73a38b97bd4b2347c40bd83da701312e93ee25fb5d", kill_on_drop: false }`
[INFO] [stdout] 34689c5d10f333c0be242c73a38b97bd4b2347c40bd83da701312e93ee25fb5d