[INFO] fetching crate palombe 0.5.1...
[INFO] testing palombe-0.5.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate palombe 0.5.1 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate palombe 0.5.1
[INFO] finished tweaking crates.io crate palombe 0.5.1
[INFO] tweaked toml for crates.io crate palombe 0.5.1 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate palombe 0.5.1 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3e63dda2ba4c0b1ee4749d91a7fa6d4830feac90c39841e797f2ef5fe870f6bd
[INFO] running `Command { std: "docker" "start" "-a" "3e63dda2ba4c0b1ee4749d91a7fa6d4830feac90c39841e797f2ef5fe870f6bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3e63dda2ba4c0b1ee4749d91a7fa6d4830feac90c39841e797f2ef5fe870f6bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e63dda2ba4c0b1ee4749d91a7fa6d4830feac90c39841e797f2ef5fe870f6bd", kill_on_drop: false }`
[INFO] [stdout] 3e63dda2ba4c0b1ee4749d91a7fa6d4830feac90c39841e797f2ef5fe870f6bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 11d2023a5b1cab45b7c27a64f1819d7766c3e846b33bdea48a8af279bced1d7b
[INFO] running `Command { std: "docker" "start" "-a" "11d2023a5b1cab45b7c27a64f1819d7766c3e846b33bdea48a8af279bced1d7b", kill_on_drop: false }`
[INFO] [stderr]    Compiling palombe v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `CString`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:180:47
[INFO] [stdout]     |
[INFO] [stdout] 180 | pub extern "C" fn c_receive(key: &CString) -> CString {
[INFO] [stdout]     |                                               ^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider passing a `*const std::ffi::c_char` instead, and use `CStr::as_ptr()`
[INFO] [stdout]     = note: `CStr`/`CString` do not have a guaranteed layout
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `Command { std: "docker" "inspect" "11d2023a5b1cab45b7c27a64f1819d7766c3e846b33bdea48a8af279bced1d7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11d2023a5b1cab45b7c27a64f1819d7766c3e846b33bdea48a8af279bced1d7b", kill_on_drop: false }`
[INFO] [stdout] 11d2023a5b1cab45b7c27a64f1819d7766c3e846b33bdea48a8af279bced1d7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a17a93d3bdb573a9f95ad183c24ef9edb47483a3f397d46b8f8d1fabcfc52ebc
[INFO] running `Command { std: "docker" "start" "-a" "a17a93d3bdb573a9f95ad183c24ef9edb47483a3f397d46b8f8d1fabcfc52ebc", kill_on_drop: false }`
[INFO] [stderr]    Compiling palombe v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `std::ffi::CString`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:180:47
[INFO] [stdout]     |
[INFO] [stdout] 180 | pub extern "C" fn c_receive(key: &CString) -> CString {
[INFO] [stdout]     |                                               ^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider passing a `*const std::ffi::c_char` instead, and use `CStr::as_ptr()`
[INFO] [stdout]     = note: `CStr`/`CString` do not have a guaranteed layout
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "a17a93d3bdb573a9f95ad183c24ef9edb47483a3f397d46b8f8d1fabcfc52ebc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a17a93d3bdb573a9f95ad183c24ef9edb47483a3f397d46b8f8d1fabcfc52ebc", kill_on_drop: false }`
[INFO] [stdout] a17a93d3bdb573a9f95ad183c24ef9edb47483a3f397d46b8f8d1fabcfc52ebc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 941d620c1a7dad71c4abdea511c4a386e918e38eed053164b0f96554da406b86
[INFO] running `Command { std: "docker" "start" "-a" "941d620c1a7dad71c4abdea511c4a386e918e38eed053164b0f96554da406b86", kill_on_drop: false }`
[INFO] [stderr] warning: `extern` fn uses type `std::ffi::CString`, which is not FFI-safe
[INFO] [stderr]    --> src/lib.rs:180:47
[INFO] [stderr]     |
[INFO] [stderr] 180 | pub extern "C" fn c_receive(key: &CString) -> CString {
[INFO] [stderr]     |                                               ^^^^^^^ not FFI-safe
[INFO] [stderr]     |
[INFO] [stderr]     = help: consider passing a `*const std::ffi::c_char` instead, and use `CStr::as_ptr()`
[INFO] [stderr]     = note: `CStr`/`CString` do not have a guaranteed layout
[INFO] [stderr]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `palombe` (lib test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/palombe-0f91335f32d89f4a)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::c_string ... ok
[INFO] [stdout] test tests::string ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "941d620c1a7dad71c4abdea511c4a386e918e38eed053164b0f96554da406b86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "941d620c1a7dad71c4abdea511c4a386e918e38eed053164b0f96554da406b86", kill_on_drop: false }`
[INFO] [stdout] 941d620c1a7dad71c4abdea511c4a386e918e38eed053164b0f96554da406b86
