[INFO] cloning repository https://github.com/cicvedu/rustlings-semester-2-1595901624
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cicvedu/rustlings-semester-2-1595901624" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-1595901624", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-1595901624'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c0535600ae62745bce7b1037038ae13b6104f4e3
[INFO] checking cicvedu/rustlings-semester-2-1595901624 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-1595901624" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 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/cicvedu/rustlings-semester-2-1595901624
[INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-1595901624
[INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] e94b7e6cc43912b4c44f717d6607a6afc53a99d4227b97cc5ac88ebec6ba5e41
[INFO] running `Command { std: "docker" "start" "-a" "e94b7e6cc43912b4c44f717d6607a6afc53a99d4227b97cc5ac88ebec6ba5e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e94b7e6cc43912b4c44f717d6607a6afc53a99d4227b97cc5ac88ebec6ba5e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e94b7e6cc43912b4c44f717d6607a6afc53a99d4227b97cc5ac88ebec6ba5e41", kill_on_drop: false }`
[INFO] [stdout] e94b7e6cc43912b4c44f717d6607a6afc53a99d4227b97cc5ac88ebec6ba5e41
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 048a3e465c93e38f34145aad57145260e401a5ee0938ccfa8d1dec500890da0d
[INFO] running `Command { std: "docker" "start" "-a" "048a3e465c93e38f34145aad57145260e401a5ee0938ccfa8d1dec500890da0d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.64
[INFO] [stderr]    Compiling unicode-ident v1.0.10
[INFO] [stderr]    Compiling quote v1.0.29
[INFO] [stderr]    Compiling serde v1.0.171
[INFO] [stderr]     Checking log v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.102
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking itoa v1.0.8
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking ryu v1.0.14
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]    Compiling tokio v1.29.1
[INFO] [stderr]    Compiling argh_shared v0.1.10
[INFO] [stderr]     Checking filetime v0.2.21
[INFO] [stderr]     Checking pin-project-lite v0.2.10
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking regex-automata v0.3.3
[INFO] [stderr]    Compiling syn v2.0.25
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking regex v1.9.1
[INFO] [stderr]    Compiling argh_derive v0.1.10
[INFO] [stderr]     Checking indicatif v0.16.2
[INFO] [stderr]     Checking predicates v1.0.8
[INFO] [stderr]    Compiling serde_derive v1.0.171
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]     Checking argh v0.1.10
[INFO] [stderr]     Checking toml v0.5.11
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking rustlings v5.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.05s
[INFO] running `Command { std: "docker" "inspect" "048a3e465c93e38f34145aad57145260e401a5ee0938ccfa8d1dec500890da0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "048a3e465c93e38f34145aad57145260e401a5ee0938ccfa8d1dec500890da0d", kill_on_drop: false }`
[INFO] [stdout] 048a3e465c93e38f34145aad57145260e401a5ee0938ccfa8d1dec500890da0d
[INFO] checking cicvedu/rustlings-semester-2-1595901624 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcicvedu%2Frustlings-semester-2-1595901624" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cicvedu/rustlings-semester-2-1595901624
[INFO] finished tweaking git repo https://github.com/cicvedu/rustlings-semester-2-1595901624
[INFO] tweaked toml for git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/cicvedu/rustlings-semester-2-1595901624 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c3ebcdf909d628b9b6846d2ad13602ee6332770f18c286342d0d4beb9fcba328
[INFO] running `Command { std: "docker" "start" "-a" "c3ebcdf909d628b9b6846d2ad13602ee6332770f18c286342d0d4beb9fcba328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3ebcdf909d628b9b6846d2ad13602ee6332770f18c286342d0d4beb9fcba328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3ebcdf909d628b9b6846d2ad13602ee6332770f18c286342d0d4beb9fcba328", kill_on_drop: false }`
[INFO] [stdout] c3ebcdf909d628b9b6846d2ad13602ee6332770f18c286342d0d4beb9fcba328
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1764b52944f55d0d9ab507381df66379de956b8da9e00bfe21840b6ef505dfc
[INFO] running `Command { std: "docker" "start" "-a" "a1764b52944f55d0d9ab507381df66379de956b8da9e00bfe21840b6ef505dfc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.64
[INFO] [stderr]    Compiling quote v1.0.29
[INFO] [stderr]    Compiling unicode-ident v1.0.10
[INFO] [stderr]    Compiling serde v1.0.171
[INFO] [stderr]     Checking log v0.4.19
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling serde_json v1.0.102
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking ryu v1.0.14
[INFO] [stderr]     Checking itoa v1.0.8
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]    Compiling tokio v1.29.1
[INFO] [stderr]    Compiling argh_shared v0.1.10
[INFO] [stderr]     Checking filetime v0.2.21
[INFO] [stderr]     Checking pin-project-lite v0.2.10
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]    Compiling syn v2.0.25
[INFO] [stderr]     Checking regex-automata v0.3.3
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]    Compiling argh_derive v0.1.10
[INFO] [stderr]     Checking regex v1.9.1
[INFO] [stderr]     Checking indicatif v0.16.2
[INFO] [stderr]     Checking predicates v1.0.8
[INFO] [stderr]     Checking argh v0.1.10
[INFO] [stderr]    Compiling serde_derive v1.0.171
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]     Checking toml v0.5.11
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking rustlings v5.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.47s
[INFO] running `Command { std: "docker" "inspect" "a1764b52944f55d0d9ab507381df66379de956b8da9e00bfe21840b6ef505dfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1764b52944f55d0d9ab507381df66379de956b8da9e00bfe21840b6ef505dfc", kill_on_drop: false }`
[INFO] [stdout] a1764b52944f55d0d9ab507381df66379de956b8da9e00bfe21840b6ef505dfc