[INFO] cloning repository https://github.com/simmons/tokio-aio-examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/simmons/tokio-aio-examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimmons%2Ftokio-aio-examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimmons%2Ftokio-aio-examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3e652b5c62960c38f5d3e1ca0ed7c258d92bfa1b
[INFO] checking simmons/tokio-aio-examples against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimmons%2Ftokio-aio-examples" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/simmons/tokio-aio-examples on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/simmons/tokio-aio-examples
[INFO] finished tweaking git repo https://github.com/simmons/tokio-aio-examples
[INFO] tweaked toml for git repo https://github.com/simmons/tokio-aio-examples written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/simmons/tokio-aio-examples already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded iovec v0.1.1
[INFO] [stderr]   Downloaded tokio-io v0.1.4
[INFO] [stderr]   Downloaded tokio-core v0.1.11
[INFO] [stderr]   Downloaded nix v0.9.0
[INFO] [stderr]   Downloaded mio v0.6.11
[INFO] [stderr]   Downloaded libc v0.2.34
[INFO] [stderr]   Downloaded futures v0.1.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b37e0cd6431fdb1e14197d91513bb6dd0b54ebddf777e62fe9f074760813a05
[INFO] running `Command { std: "docker" "start" "-a" "5b37e0cd6431fdb1e14197d91513bb6dd0b54ebddf777e62fe9f074760813a05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b37e0cd6431fdb1e14197d91513bb6dd0b54ebddf777e62fe9f074760813a05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b37e0cd6431fdb1e14197d91513bb6dd0b54ebddf777e62fe9f074760813a05", kill_on_drop: false }`
[INFO] [stdout] 5b37e0cd6431fdb1e14197d91513bb6dd0b54ebddf777e62fe9f074760813a05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9904fb28af7734274a527ae12586c592e9fe1e08a7f81e75e8d30de7e4ba2bc
[INFO] running `Command { std: "docker" "start" "-a" "d9904fb28af7734274a527ae12586c592e9fe1e08a7f81e75e8d30de7e4ba2bc", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.34
[INFO] [stderr]     Checking byteorder v1.2.1
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]     Checking cfg-if v0.1.2
[INFO] [stderr]     Checking futures v0.1.17
[INFO] [stderr]     Checking lazycell v0.5.1
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking slab v0.4.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking iovec v0.1.1
[INFO] [stderr]     Checking net2 v0.2.31
[INFO] [stderr]     Checking bytes v0.4.5
[INFO] [stderr]     Checking mio v0.6.11
[INFO] [stderr]     Checking tokio-io v0.1.4
[INFO] [stderr]     Checking tokio-core v0.1.11
[INFO] [stderr]     Checking tokio-aio-examples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/bin/echo-tokio-mpsc.rs:147:13
[INFO] [stdout]     |
[INFO] [stdout] 147 |             drop(message);
[INFO] [stdout]     |             ^^^^^-------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&Message`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/bin/echo-tokio-mpsc.rs:147:13
[INFO] [stdout]     |
[INFO] [stdout] 147 |             drop(message);
[INFO] [stdout]     |             ^^^^^-------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&Message`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.17s
[INFO] running `Command { std: "docker" "inspect" "d9904fb28af7734274a527ae12586c592e9fe1e08a7f81e75e8d30de7e4ba2bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9904fb28af7734274a527ae12586c592e9fe1e08a7f81e75e8d30de7e4ba2bc", kill_on_drop: false }`
[INFO] [stdout] d9904fb28af7734274a527ae12586c592e9fe1e08a7f81e75e8d30de7e4ba2bc