[INFO] fetching crate rrt0 0.1.3...
[INFO] checking rrt0-0.1.3 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate rrt0 0.1.3 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate rrt0 0.1.3 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rrt0 0.1.3
[INFO] finished tweaking crates.io crate rrt0 0.1.3
[INFO] tweaked toml for crates.io crate rrt0 0.1.3 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6785697984c28166017fcc7302b0691ba4b5979dc5e668a6e0b1edf0bcbb84f1
[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" "6785697984c28166017fcc7302b0691ba4b5979dc5e668a6e0b1edf0bcbb84f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6785697984c28166017fcc7302b0691ba4b5979dc5e668a6e0b1edf0bcbb84f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6785697984c28166017fcc7302b0691ba4b5979dc5e668a6e0b1edf0bcbb84f1", kill_on_drop: false }`
[INFO] [stdout] 6785697984c28166017fcc7302b0691ba4b5979dc5e668a6e0b1edf0bcbb84f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ece80faefaa08029de304d11a7aaa2ca0059c8d309319eb83036bc5189eaaa4c
[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" "ece80faefaa08029de304d11a7aaa2ca0059c8d309319eb83036bc5189eaaa4c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]     Checking rrt0 v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `fn() -> T`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 | extern "C" fn start<T>(user_main: fn() -> T, _argc: isize, _argv: *const *const u8) -> isize
[INFO] [stdout]    |                                   ^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider using an `extern fn(...) -> ...` function pointer instead
[INFO] [stdout]    = note: this function pointer has Rust-specific calling convention
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.09s
[INFO] running `Command { std: "docker" "inspect" "ece80faefaa08029de304d11a7aaa2ca0059c8d309319eb83036bc5189eaaa4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ece80faefaa08029de304d11a7aaa2ca0059c8d309319eb83036bc5189eaaa4c", kill_on_drop: false }`
[INFO] [stdout] ece80faefaa08029de304d11a7aaa2ca0059c8d309319eb83036bc5189eaaa4c