[INFO] fetching crate amplify 0.1.8...
[INFO] checking amplify-0.1.8 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate amplify 0.1.8 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate amplify 0.1.8 on toolchain d990716b6a1fdde1300748828a9c9e79dfd0b898
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate amplify 0.1.8
[INFO] finished tweaking crates.io crate amplify 0.1.8
[INFO] tweaked toml for crates.io crate amplify 0.1.8 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e47f0081b828ca4ec707ea1fcf701ffbe743bcec8bcbb80d09b577984adee418
[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" "e47f0081b828ca4ec707ea1fcf701ffbe743bcec8bcbb80d09b577984adee418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e47f0081b828ca4ec707ea1fcf701ffbe743bcec8bcbb80d09b577984adee418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e47f0081b828ca4ec707ea1fcf701ffbe743bcec8bcbb80d09b577984adee418", kill_on_drop: false }`
[INFO] [stdout] e47f0081b828ca4ec707ea1fcf701ffbe743bcec8bcbb80d09b577984adee418
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83cc7cf791d6447a53d00235f3f4e5101c9b68ee5d4adc60771fbc36e83a4ec5
[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" "83cc7cf791d6447a53d00235f3f4e5101c9b68ee5d4adc60771fbc36e83a4ec5", kill_on_drop: false }`
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]     Checking syn v1.0.38
[INFO] [stderr]     Checking amplify v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `unwrapped`
[INFO] [stdout]    --> src/macros.rs:20:13
[INFO] [stdout]     |
[INFO] [stdout] 20  |         let $var = if let Some($var) = $option {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_unwrapped`
[INFO] [stdout] ...
[INFO] [stdout] 129 |         guard! { let unwrapped = opt else { assert!(false) } }
[INFO] [stdout]     |         ------------------------------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_guard`
[INFO] [stdout]    --> src/macros.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 |     fn test_guard() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.07s
[INFO] running `Command { std: "docker" "inspect" "83cc7cf791d6447a53d00235f3f4e5101c9b68ee5d4adc60771fbc36e83a4ec5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83cc7cf791d6447a53d00235f3f4e5101c9b68ee5d4adc60771fbc36e83a4ec5", kill_on_drop: false }`
[INFO] [stdout] 83cc7cf791d6447a53d00235f3f4e5101c9b68ee5d4adc60771fbc36e83a4ec5