[INFO] cloning repository https://github.com/robertohuertasm/rust-a-gentle-introduction
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/robertohuertasm/rust-a-gentle-introduction" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertohuertasm%2Frust-a-gentle-introduction", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertohuertasm%2Frust-a-gentle-introduction'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7e36dbf2139c284f68e110fefd1edc88dec8e3ab
[INFO] checking robertohuertasm/rust-a-gentle-introduction against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertohuertasm%2Frust-a-gentle-introduction" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/robertohuertasm/rust-a-gentle-introduction on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/robertohuertasm/rust-a-gentle-introduction
[INFO] finished tweaking git repo https://github.com/robertohuertasm/rust-a-gentle-introduction
[INFO] tweaked toml for git repo https://github.com/robertohuertasm/rust-a-gentle-introduction written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/robertohuertasm/rust-a-gentle-introduction already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fbb163bf0b7dbe06a061d6eeff8b250f8a760be7392f751fabe7ab6e0e07fbf8
[INFO] running `Command { std: "docker" "start" "-a" "fbb163bf0b7dbe06a061d6eeff8b250f8a760be7392f751fabe7ab6e0e07fbf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fbb163bf0b7dbe06a061d6eeff8b250f8a760be7392f751fabe7ab6e0e07fbf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbb163bf0b7dbe06a061d6eeff8b250f8a760be7392f751fabe7ab6e0e07fbf8", kill_on_drop: false }`
[INFO] [stdout] fbb163bf0b7dbe06a061d6eeff8b250f8a760be7392f751fabe7ab6e0e07fbf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6fa4636c83a7f939695a26baa0376dfcea9a59506c2afd6346ccef7185bfa24
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c6fa4636c83a7f939695a26baa0376dfcea9a59506c2afd6346ccef7185bfa24", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking rayon-core v1.4.0
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]     Checking gentle_intro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]  --> src/other_things.rs:7:36
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub extern "C" fn fast_blank(text: &str) -> bool {
[INFO] [stdout]   |                                    ^^^^ not FFI-safe
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]   = help: consider using `*const u8` and a length instead
[INFO] [stdout]   = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]  --> src/other_things.rs:7:36
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub extern "C" fn fast_blank(text: &str) -> bool {
[INFO] [stdout]   |                                    ^^^^ not FFI-safe
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]   = help: consider using `*const u8` and a length instead
[INFO] [stdout]   = note: string slices have no C equivalent
[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 [unoptimized + debuginfo] target(s) in 3.36s
[INFO] running `Command { std: "docker" "inspect" "c6fa4636c83a7f939695a26baa0376dfcea9a59506c2afd6346ccef7185bfa24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6fa4636c83a7f939695a26baa0376dfcea9a59506c2afd6346ccef7185bfa24", kill_on_drop: false }`
[INFO] [stdout] c6fa4636c83a7f939695a26baa0376dfcea9a59506c2afd6346ccef7185bfa24