[INFO] cloning repository https://github.com/saschanaz/rust-assignment-mailbox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/saschanaz/rust-assignment-mailbox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Frust-assignment-mailbox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Frust-assignment-mailbox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] efc753472aa0a0adbdfb5b69d65404c873417d5d
[INFO] checking saschanaz/rust-assignment-mailbox against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Frust-assignment-mailbox" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/saschanaz/rust-assignment-mailbox 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/saschanaz/rust-assignment-mailbox
[INFO] finished tweaking git repo https://github.com/saschanaz/rust-assignment-mailbox
[INFO] tweaked toml for git repo https://github.com/saschanaz/rust-assignment-mailbox written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/saschanaz/rust-assignment-mailbox 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] e20b85cec80095aab051ce37e1f9d8369f89d543ed43209c0df2120349c1c43b
[INFO] running `Command { std: "docker" "start" "-a" "e20b85cec80095aab051ce37e1f9d8369f89d543ed43209c0df2120349c1c43b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e20b85cec80095aab051ce37e1f9d8369f89d543ed43209c0df2120349c1c43b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e20b85cec80095aab051ce37e1f9d8369f89d543ed43209c0df2120349c1c43b", kill_on_drop: false }`
[INFO] [stdout] e20b85cec80095aab051ce37e1f9d8369f89d543ed43209c0df2120349c1c43b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 061057bf7b0899e6de0bbfbe73fa309b381a5170cdd9a2db65f7fd59ccd703ae
[INFO] running `Command { std: "docker" "start" "-a" "061057bf7b0899e6de0bbfbe73fa309b381a5170cdd9a2db65f7fd59ccd703ae", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling syn v2.0.51
[INFO] [stderr]     Checking socket2 v0.5.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking simple-db v0.1.0 (/opt/rustwide/workdir/simple-db)
[INFO] [stderr]     Checking tcp-server v0.1.0 (/opt/rustwide/workdir/tcp-server)
[INFO] [stdout] warning: the item `tokio` is imported redundantly
[INFO] [stdout]  --> tcp-server/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     self,
[INFO] [stdout]   |     ^^^^ the item `tokio` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio` is imported redundantly
[INFO] [stdout]  --> tcp-server/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     self,
[INFO] [stdout]   |     ^^^^ the item `tokio` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.81s
[INFO] running `Command { std: "docker" "inspect" "061057bf7b0899e6de0bbfbe73fa309b381a5170cdd9a2db65f7fd59ccd703ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "061057bf7b0899e6de0bbfbe73fa309b381a5170cdd9a2db65f7fd59ccd703ae", kill_on_drop: false }`
[INFO] [stdout] 061057bf7b0899e6de0bbfbe73fa309b381a5170cdd9a2db65f7fd59ccd703ae
[INFO] checking saschanaz/rust-assignment-mailbox against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaschanaz%2Frust-assignment-mailbox" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/saschanaz/rust-assignment-mailbox on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/saschanaz/rust-assignment-mailbox
[INFO] finished tweaking git repo https://github.com/saschanaz/rust-assignment-mailbox
[INFO] tweaked toml for git repo https://github.com/saschanaz/rust-assignment-mailbox written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/saschanaz/rust-assignment-mailbox 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 722308edad0e2eb1b8a060552a2a2e9974638de12418e7e28dec42f5cf47df5c
[INFO] running `Command { std: "docker" "start" "-a" "722308edad0e2eb1b8a060552a2a2e9974638de12418e7e28dec42f5cf47df5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "722308edad0e2eb1b8a060552a2a2e9974638de12418e7e28dec42f5cf47df5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "722308edad0e2eb1b8a060552a2a2e9974638de12418e7e28dec42f5cf47df5c", kill_on_drop: false }`
[INFO] [stdout] 722308edad0e2eb1b8a060552a2a2e9974638de12418e7e28dec42f5cf47df5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9045181f922da0e5c29cd0595dd938f41a33dcee21bb5b65162e83867184fd78
[INFO] running `Command { std: "docker" "start" "-a" "9045181f922da0e5c29cd0595dd938f41a33dcee21bb5b65162e83867184fd78", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling syn v2.0.51
[INFO] [stderr]     Checking socket2 v0.5.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking simple-db v0.1.0 (/opt/rustwide/workdir/simple-db)
[INFO] [stderr]     Checking tcp-server v0.1.0 (/opt/rustwide/workdir/tcp-server)
[INFO] [stdout] warning: the item `tokio` is imported redundantly
[INFO] [stdout]  --> tcp-server/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     self,
[INFO] [stdout]   |     ^^^^ the item `tokio` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio` is imported redundantly
[INFO] [stdout]  --> tcp-server/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     self,
[INFO] [stdout]   |     ^^^^ the item `tokio` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.51s
[INFO] running `Command { std: "docker" "inspect" "9045181f922da0e5c29cd0595dd938f41a33dcee21bb5b65162e83867184fd78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9045181f922da0e5c29cd0595dd938f41a33dcee21bb5b65162e83867184fd78", kill_on_drop: false }`
[INFO] [stdout] 9045181f922da0e5c29cd0595dd938f41a33dcee21bb5b65162e83867184fd78