[INFO] cloning repository https://github.com/danslobodan/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danslobodan/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanslobodan%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanslobodan%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 30ed217ebca76224752af5fd42d5a330a4f28867
[INFO] checking danslobodan/learning-rust against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanslobodan%2Flearning-rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danslobodan/learning-rust 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/danslobodan/learning-rust
[INFO] finished tweaking git repo https://github.com/danslobodan/learning-rust
[INFO] tweaked toml for git repo https://github.com/danslobodan/learning-rust written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/danslobodan/learning-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sha256 v1.4.0
[INFO] [stderr]   Downloaded ureq v2.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 5494f8d86f3864b920b8f67ac98e3d21a96916f82b6f5d8ba06d99b439c65f3a
[INFO] running `Command { std: "docker" "start" "-a" "5494f8d86f3864b920b8f67ac98e3d21a96916f82b6f5d8ba06d99b439c65f3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5494f8d86f3864b920b8f67ac98e3d21a96916f82b6f5d8ba06d99b439c65f3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5494f8d86f3864b920b8f67ac98e3d21a96916f82b6f5d8ba06d99b439c65f3a", kill_on_drop: false }`
[INFO] [stdout] 5494f8d86f3864b920b8f67ac98e3d21a96916f82b6f5d8ba06d99b439c65f3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 5bcdf971c3e15f0a4fe738badeed20308a76d17d7e52f953054a1513ae525ecf
[INFO] running `Command { std: "docker" "start" "-a" "5bcdf971c3e15f0a4fe738badeed20308a76d17d7e52f953054a1513ae525ecf", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling parking_lot_core v0.9.8
[INFO] [stderr]     Checking smallvec v1.11.0
[INFO] [stderr]    Compiling num-traits v0.2.16
[INFO] [stderr]    Compiling rustls v0.21.7
[INFO] [stderr]    Compiling async-trait v0.1.73
[INFO] [stderr]     Checking aho-corasick v1.0.4
[INFO] [stderr]     Checking bytes v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.7.4
[INFO] [stderr]     Checking cpufeatures v0.2.9
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking mio v0.8.8
[INFO] [stderr]     Checking socket2 v0.5.3
[INFO] [stderr]     Checking flate2 v1.0.27
[INFO] [stderr]     Checking generic-array v0.14.7
[INFO] [stderr]     Checking base64 v0.21.3
[INFO] [stderr]     Checking iana-time-zone v0.1.57
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking array_tool v1.0.3
[INFO] [stderr]     Checking chrono v0.4.30
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking regex-automata v0.3.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.7
[INFO] [stderr]     Checking regex v1.9.3
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]     Checking rustls-webpki v0.101.4
[INFO] [stderr]     Checking rustls-webpki v0.100.2
[INFO] [stderr]     Checking sct v0.7.0
[INFO] [stderr]     Checking tokio v1.32.0
[INFO] [stderr]     Checking webpki-roots v0.23.1
[INFO] [stderr]     Checking ureq v2.7.1
[INFO] [stderr]     Checking sha256 v1.4.0
[INFO] [stderr]     Checking learning_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `string_literals` is never used
[INFO] [stdout]  --> src/strings.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn string_literals() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_literals` is never used
[INFO] [stdout]  --> src/strings.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn string_literals() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` 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 35.99s
[INFO] running `Command { std: "docker" "inspect" "5bcdf971c3e15f0a4fe738badeed20308a76d17d7e52f953054a1513ae525ecf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bcdf971c3e15f0a4fe738badeed20308a76d17d7e52f953054a1513ae525ecf", kill_on_drop: false }`
[INFO] [stdout] 5bcdf971c3e15f0a4fe738badeed20308a76d17d7e52f953054a1513ae525ecf