[INFO] fetching crate samuel 0.1.2...
[INFO] checking samuel-0.1.2 against try#353a0a223066e9f46a1d935f2271a26c3c5002bb for pr-75180
[INFO] extracting crate samuel 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate samuel 0.1.2 on toolchain 353a0a223066e9f46a1d935f2271a26c3c5002bb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate samuel 0.1.2
[INFO] finished tweaking crates.io crate samuel 0.1.2
[INFO] tweaked toml for crates.io crate samuel 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63d128c1f5a3e3d3f506f0cb8ac3d163e812fc77c81a86634f4808d55abb8bd9
[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" "63d128c1f5a3e3d3f506f0cb8ac3d163e812fc77c81a86634f4808d55abb8bd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63d128c1f5a3e3d3f506f0cb8ac3d163e812fc77c81a86634f4808d55abb8bd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63d128c1f5a3e3d3f506f0cb8ac3d163e812fc77c81a86634f4808d55abb8bd9", kill_on_drop: false }`
[INFO] [stdout] 63d128c1f5a3e3d3f506f0cb8ac3d163e812fc77c81a86634f4808d55abb8bd9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b60390c4a6617c9ec0430e020c84fdcd1ed4c7c45a1990bce3af359d6810590
[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" "3b60390c4a6617c9ec0430e020c84fdcd1ed4c7c45a1990bce3af359d6810590", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]     Checking xmlparser v0.8.1
[INFO] [stderr]     Checking roxmltree v0.4.1
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking samuel v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/assertion.rs:323:17
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn try_from(n: Node) -> Result<Self, Self::Err> {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/assertion.rs:334:17
[INFO] [stdout]     |
[INFO] [stdout] 334 |     fn try_from(n: Node) -> Result<Self, Self::Err> {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/assertion.rs:323:17
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn try_from(n: Node) -> Result<Self, Self::Err> {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/assertion.rs:334:17
[INFO] [stdout]     |
[INFO] [stdout] 334 |     fn try_from(n: Node) -> Result<Self, Self::Err> {
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.78s
[INFO] running `Command { std: "docker" "inspect" "3b60390c4a6617c9ec0430e020c84fdcd1ed4c7c45a1990bce3af359d6810590", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b60390c4a6617c9ec0430e020c84fdcd1ed4c7c45a1990bce3af359d6810590", kill_on_drop: false }`
[INFO] [stdout] 3b60390c4a6617c9ec0430e020c84fdcd1ed4c7c45a1990bce3af359d6810590