[INFO] fetching crate btreemultimap 0.1.0...
[INFO] checking btreemultimap-0.1.0 against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] extracting crate btreemultimap 0.1.0 into /workspace/builds/worker-66/source
[INFO] validating manifest of crates.io crate btreemultimap 0.1.0 on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate btreemultimap 0.1.0
[INFO] finished tweaking crates.io crate btreemultimap 0.1.0
[INFO] tweaked toml for crates.io crate btreemultimap 0.1.0 written to /workspace/builds/worker-66/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "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" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86b44b75bb4a93afcc7c9dbe69418cfbf1cbcfa634c997d22b5d54c139ed4c29
[INFO] running `Command { std: "docker" "start" "-a" "86b44b75bb4a93afcc7c9dbe69418cfbf1cbcfa634c997d22b5d54c139ed4c29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86b44b75bb4a93afcc7c9dbe69418cfbf1cbcfa634c997d22b5d54c139ed4c29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86b44b75bb4a93afcc7c9dbe69418cfbf1cbcfa634c997d22b5d54c139ed4c29", kill_on_drop: false }`
[INFO] [stdout] 86b44b75bb4a93afcc7c9dbe69418cfbf1cbcfa634c997d22b5d54c139ed4c29
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74a8c0ed4b2f00e74872e90a8eff3d3e247c7aaa85593a277d2cc91ce42b62d5
[INFO] running `Command { std: "docker" "start" "-a" "74a8c0ed4b2f00e74872e90a8eff3d3e247c7aaa85593a277d2cc91ce42b62d5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]     Checking serde_test v1.0.127
[INFO] [stderr]     Checking btreemultimap v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:1170:9
[INFO] [stdout]      |
[INFO] [stdout] 1170 |         &m[&1];
[INFO] [stdout]      |         ^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1170 |         let _ = &m[&1];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.79s
[INFO] running `Command { std: "docker" "inspect" "74a8c0ed4b2f00e74872e90a8eff3d3e247c7aaa85593a277d2cc91ce42b62d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74a8c0ed4b2f00e74872e90a8eff3d3e247c7aaa85593a277d2cc91ce42b62d5", kill_on_drop: false }`
[INFO] [stdout] 74a8c0ed4b2f00e74872e90a8eff3d3e247c7aaa85593a277d2cc91ce42b62d5