[INFO] fetching crate swallow 0.1.0...
[INFO] testing swallow-0.1.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate swallow 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate swallow 0.1.0
[INFO] finished tweaking crates.io crate swallow 0.1.0
[INFO] tweaked toml for crates.io crate swallow 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate swallow 0.1.0 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] 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 284574bcc2560feee09c0920ee6f7f8f4b6fbd42fc7ea2d7ef814bc61e5703e0
[INFO] running `Command { std: "docker" "start" "-a" "284574bcc2560feee09c0920ee6f7f8f4b6fbd42fc7ea2d7ef814bc61e5703e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "284574bcc2560feee09c0920ee6f7f8f4b6fbd42fc7ea2d7ef814bc61e5703e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "284574bcc2560feee09c0920ee6f7f8f4b6fbd42fc7ea2d7ef814bc61e5703e0", kill_on_drop: false }`
[INFO] [stdout] 284574bcc2560feee09c0920ee6f7f8f4b6fbd42fc7ea2d7ef814bc61e5703e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] c0e83fea3ca2e4536e6d57fddd25f2714ef65e0aa24250b8d871b45d27dda7ee
[INFO] running `Command { std: "docker" "start" "-a" "c0e83fea3ca2e4536e6d57fddd25f2714ef65e0aa24250b8d871b45d27dda7ee", kill_on_drop: false }`
[INFO] [stderr]    Compiling swallow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/main.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<(), Box<Error>> {
[INFO] [stdout]   |                             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]   |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "c0e83fea3ca2e4536e6d57fddd25f2714ef65e0aa24250b8d871b45d27dda7ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0e83fea3ca2e4536e6d57fddd25f2714ef65e0aa24250b8d871b45d27dda7ee", kill_on_drop: false }`
[INFO] [stdout] c0e83fea3ca2e4536e6d57fddd25f2714ef65e0aa24250b8d871b45d27dda7ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] e527cf77e9bf42d0e5c9285b597e1d8bd717a9f9351cd415cb6ca45b7dfdfea4
[INFO] running `Command { std: "docker" "start" "-a" "e527cf77e9bf42d0e5c9285b597e1d8bd717a9f9351cd415cb6ca45b7dfdfea4", kill_on_drop: false }`
[INFO] [stderr]    Compiling swallow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/main.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<(), Box<Error>> {
[INFO] [stdout]   |                             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]   |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "e527cf77e9bf42d0e5c9285b597e1d8bd717a9f9351cd415cb6ca45b7dfdfea4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e527cf77e9bf42d0e5c9285b597e1d8bd717a9f9351cd415cb6ca45b7dfdfea4", kill_on_drop: false }`
[INFO] [stdout] e527cf77e9bf42d0e5c9285b597e1d8bd717a9f9351cd415cb6ca45b7dfdfea4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 9482e8b3d223d9f385d88cf16f928d71a1d239cdafbbb338e8eea03f759cf06a
[INFO] running `Command { std: "docker" "start" "-a" "9482e8b3d223d9f385d88cf16f928d71a1d239cdafbbb338e8eea03f759cf06a", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/main.rs:4:29
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn main() -> Result<(), Box<Error>> {
[INFO] [stderr]   |                             ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stderr]   |                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: `swallow` (bin "swallow" test) generated 1 warning (run `cargo fix --bin "swallow" -p swallow --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/swallow-54d5b6f7d0219235)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9482e8b3d223d9f385d88cf16f928d71a1d239cdafbbb338e8eea03f759cf06a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9482e8b3d223d9f385d88cf16f928d71a1d239cdafbbb338e8eea03f759cf06a", kill_on_drop: false }`
[INFO] [stdout] 9482e8b3d223d9f385d88cf16f928d71a1d239cdafbbb338e8eea03f759cf06a
