[INFO] fetching crate cascade 0.1.4...
[INFO] checking cascade-0.1.4 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate cascade 0.1.4 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate cascade 0.1.4 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cascade 0.1.4
[INFO] finished tweaking crates.io crate cascade 0.1.4
[INFO] tweaked toml for crates.io crate cascade 0.1.4 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate cascade 0.1.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e3a5eafdc8eb321ccf6a5ea9f3e88181fe04f75e0ebb6a4a807d18e69f7eaae6
[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" "e3a5eafdc8eb321ccf6a5ea9f3e88181fe04f75e0ebb6a4a807d18e69f7eaae6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3a5eafdc8eb321ccf6a5ea9f3e88181fe04f75e0ebb6a4a807d18e69f7eaae6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3a5eafdc8eb321ccf6a5ea9f3e88181fe04f75e0ebb6a4a807d18e69f7eaae6", kill_on_drop: false }`
[INFO] [stdout] e3a5eafdc8eb321ccf6a5ea9f3e88181fe04f75e0ebb6a4a807d18e69f7eaae6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f34dc6bbebd4cdfb74d39653f7e3300cbe650a22666099f60e3de50f1cd079e0
[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" "f34dc6bbebd4cdfb74d39653f7e3300cbe650a22666099f60e3de50f1cd079e0", kill_on_drop: false }`
[INFO] [stderr]     Checking cascade v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `method_chain_example`
[INFO] [stdout]   --> examples/basic_cascades.rs:87:7
[INFO] [stdout]    |
[INFO] [stdout] 87 |   let method_chain_example = cascade! {
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_method_chain_example`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> examples/basic_cascades.rs:93:3
[INFO] [stdout]    |
[INFO] [stdout] 93 |   option_cascade_test();
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "f34dc6bbebd4cdfb74d39653f7e3300cbe650a22666099f60e3de50f1cd079e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f34dc6bbebd4cdfb74d39653f7e3300cbe650a22666099f60e3de50f1cd079e0", kill_on_drop: false }`
[INFO] [stdout] f34dc6bbebd4cdfb74d39653f7e3300cbe650a22666099f60e3de50f1cd079e0