[INFO] cloning repository https://github.com/kermit4/first_16_hours_of_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kermit4/first_16_hours_of_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkermit4%2Ffirst_16_hours_of_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkermit4%2Ffirst_16_hours_of_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3c46ddffdaad3876aae75a4432871b7e25109904
[INFO] testing kermit4/first_16_hours_of_rust against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkermit4%2Ffirst_16_hours_of_rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kermit4/first_16_hours_of_rust
[INFO] finished tweaking git repo https://github.com/kermit4/first_16_hours_of_rust
[INFO] tweaked toml for git repo https://github.com/kermit4/first_16_hours_of_rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kermit4/first_16_hours_of_rust on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kermit4/first_16_hours_of_rust 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4b1a1f192d119ce441320f41ff70b647422bd68e661fa2b9406b16ad3f9c073f
[INFO] running `Command { std: "docker" "start" "-a" "4b1a1f192d119ce441320f41ff70b647422bd68e661fa2b9406b16ad3f9c073f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b1a1f192d119ce441320f41ff70b647422bd68e661fa2b9406b16ad3f9c073f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b1a1f192d119ce441320f41ff70b647422bd68e661fa2b9406b16ad3f9c073f", kill_on_drop: false }`
[INFO] [stdout] 4b1a1f192d119ce441320f41ff70b647422bd68e661fa2b9406b16ad3f9c073f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a17f8bf72bad30b4c4c9861ae7a72db395b933f7b29eb8e336d5f4144aaa3474
[INFO] running `Command { std: "docker" "start" "-a" "a17f8bf72bad30b4c4c9861ae7a72db395b933f7b29eb8e336d5f4144aaa3474", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling cpuid-bool v0.1.2
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling sha2 v0.9.3
[INFO] [stderr]    Compiling bincode v1.3.2
[INFO] [stderr]    Compiling serde-big-array v0.3.1
[INFO] [stderr]    Compiling udp_uploader 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/main.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 drop(&self.file); // free up a file descriptor
[INFO] [stdout]    |                 ^^^^^----------^
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      argument has type `&File`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 76 -                 drop(&self.file); // free up a file descriptor
[INFO] [stdout] 76 +                 let _ = &self.file; // free up a file descriptor
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.15s
[INFO] running `Command { std: "docker" "inspect" "a17f8bf72bad30b4c4c9861ae7a72db395b933f7b29eb8e336d5f4144aaa3474", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a17f8bf72bad30b4c4c9861ae7a72db395b933f7b29eb8e336d5f4144aaa3474", kill_on_drop: false }`
[INFO] [stdout] a17f8bf72bad30b4c4c9861ae7a72db395b933f7b29eb8e336d5f4144aaa3474
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a7a94f41b02c6d9c981da297ed5902ad95dbb7e0a700579dd7efa029c6910ec
[INFO] running `Command { std: "docker" "start" "-a" "9a7a94f41b02c6d9c981da297ed5902ad95dbb7e0a700579dd7efa029c6910ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling udp_uploader 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/main.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 drop(&self.file); // free up a file descriptor
[INFO] [stdout]    |                 ^^^^^----------^
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      argument has type `&File`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 76 -                 drop(&self.file); // free up a file descriptor
[INFO] [stdout] 76 +                 let _ = &self.file; // free up a file descriptor
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "9a7a94f41b02c6d9c981da297ed5902ad95dbb7e0a700579dd7efa029c6910ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a7a94f41b02c6d9c981da297ed5902ad95dbb7e0a700579dd7efa029c6910ec", kill_on_drop: false }`
[INFO] [stdout] 9a7a94f41b02c6d9c981da297ed5902ad95dbb7e0a700579dd7efa029c6910ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 94b6b500bba890e7140d2c9ddc7c53e85899ef264821974d73decb3dec54ba31
[INFO] running `Command { std: "docker" "start" "-a" "94b6b500bba890e7140d2c9ddc7c53e85899ef264821974d73decb3dec54ba31", kill_on_drop: false }`
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout] 
[INFO] [stderr]   --> src/main.rs:76:17
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 76 |                 drop(&self.file); // free up a file descriptor
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |                 ^^^^^----------^
[INFO] [stdout] 
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      argument has type `&File`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]    |
[INFO] [stderr] 76 -                 drop(&self.file); // free up a file descriptor
[INFO] [stderr] 76 +                 let _ = &self.file; // free up a file descriptor
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `udp_uploader` (bin "udp_uploader" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/udp_uploader-7e312270b5607b10)
[INFO] running `Command { std: "docker" "inspect" "94b6b500bba890e7140d2c9ddc7c53e85899ef264821974d73decb3dec54ba31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94b6b500bba890e7140d2c9ddc7c53e85899ef264821974d73decb3dec54ba31", kill_on_drop: false }`
[INFO] [stdout] 94b6b500bba890e7140d2c9ddc7c53e85899ef264821974d73decb3dec54ba31
