[INFO] fetching crate amplify 0.1.8...
[INFO] checking amplify-0.1.8 against try#ffa4a0215752773248fb0f0a8092f1c3e7907e9e for pr-75585
[INFO] extracting crate amplify 0.1.8 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate amplify 0.1.8 on toolchain ffa4a0215752773248fb0f0a8092f1c3e7907e9e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "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-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a8a337d6841baf175a29c640fd5b5dfea7c6a516d3336c472e0ac6396af2e548
[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" "a8a337d6841baf175a29c640fd5b5dfea7c6a516d3336c472e0ac6396af2e548", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8a337d6841baf175a29c640fd5b5dfea7c6a516d3336c472e0ac6396af2e548", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8a337d6841baf175a29c640fd5b5dfea7c6a516d3336c472e0ac6396af2e548", kill_on_drop: false }`
[INFO] [stdout] a8a337d6841baf175a29c640fd5b5dfea7c6a516d3336c472e0ac6396af2e548
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ee0fb372f7a2ff92606e9fdbc1edbc56060290173e7f1126b48c31aade74d57
[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" "2ee0fb372f7a2ff92606e9fdbc1edbc56060290173e7f1126b48c31aade74d57", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking proc-macro2 v1.0.20
[INFO] [stderr]     Checking quote v1.0.7
[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 5.96s
[INFO] running `Command { std: "docker" "inspect" "2ee0fb372f7a2ff92606e9fdbc1edbc56060290173e7f1126b48c31aade74d57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ee0fb372f7a2ff92606e9fdbc1edbc56060290173e7f1126b48c31aade74d57", kill_on_drop: false }`
[INFO] [stdout] 2ee0fb372f7a2ff92606e9fdbc1edbc56060290173e7f1126b48c31aade74d57