[INFO] cloning repository https://github.com/SpencerN319/rust_book [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SpencerN319/rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpencerN319%2Frust_book", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpencerN319%2Frust_book'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] be2430bf15ffea5439b933e5cffc8695a78c941c [INFO] testing SpencerN319/rust_book against beta-2022-02-22 for beta-1.60-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpencerN319%2Frust_book" "/workspace/builds/worker-20/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-20/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/SpencerN319/rust_book on toolchain beta-2022-02-22 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/SpencerN319/rust_book [INFO] finished tweaking git repo https://github.com/SpencerN319/rust_book [INFO] tweaked toml for git repo https://github.com/SpencerN319/rust_book written to /workspace/builds/worker-20/source/Cargo.toml [INFO] crate git repo https://github.com/SpencerN319/rust_book already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 6e5855de2c49852598c0dfb1dfc536d1b8cfa7ff2340354ba17a40a14b21a4f5 [INFO] running `Command { std: "docker" "start" "-a" "6e5855de2c49852598c0dfb1dfc536d1b8cfa7ff2340354ba17a40a14b21a4f5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "6e5855de2c49852598c0dfb1dfc536d1b8cfa7ff2340354ba17a40a14b21a4f5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6e5855de2c49852598c0dfb1dfc536d1b8cfa7ff2340354ba17a40a14b21a4f5", kill_on_drop: false }` [INFO] [stdout] 6e5855de2c49852598c0dfb1dfc536d1b8cfa7ff2340354ba17a40a14b21a4f5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c2b927ea4613bd58e0ff2947ff2b7e0e14798ef5e04bbe46ccbdb3f5a6478d2d [INFO] running `Command { std: "docker" "start" "-a" "c2b927ea4613bd58e0ff2947ff2b7e0e14798ef5e04bbe46ccbdb3f5a6478d2d", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.97 [INFO] [stderr] Compiling ppv-lite86 v0.2.10 [INFO] [stderr] Compiling getrandom v0.2.3 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling rust_book v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0277]: the trait bound `String: From<()>` is not satisfied [INFO] [stdout] --> src/functions.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | String::from(s1.push_str(s2)) [INFO] [stdout] | ^^^^^^^^^^^^ the trait `From<()>` is not implemented for `String` [INFO] [stdout] | [INFO] [stdout] = help: the following implementations were found: [INFO] [stdout] > [INFO] [stdout] > [INFO] [stdout] > [INFO] [stdout] >> [INFO] [stdout] and 2 others [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `rust_book` due to 2 previous errors [INFO] running `Command { std: "docker" "inspect" "c2b927ea4613bd58e0ff2947ff2b7e0e14798ef5e04bbe46ccbdb3f5a6478d2d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c2b927ea4613bd58e0ff2947ff2b7e0e14798ef5e04bbe46ccbdb3f5a6478d2d", kill_on_drop: false }` [INFO] [stdout] c2b927ea4613bd58e0ff2947ff2b7e0e14798ef5e04bbe46ccbdb3f5a6478d2d