[INFO] fetching crate xmail 0.1.15...
[INFO] testing xmail-0.1.15 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate xmail 0.1.15 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate xmail 0.1.15
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate xmail 0.1.15
[INFO] tweaked toml for crates.io crate xmail 0.1.15 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate xmail 0.1.15 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate xmail 0.1.15 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" "+beta-2025-09-21" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9786ea44186b1d71a3d266623aa47f5f7211f210bd790a3a39ec64b1f628d7b6
[INFO] running `Command { std: "docker" "start" "-a" "9786ea44186b1d71a3d266623aa47f5f7211f210bd790a3a39ec64b1f628d7b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9786ea44186b1d71a3d266623aa47f5f7211f210bd790a3a39ec64b1f628d7b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9786ea44186b1d71a3d266623aa47f5f7211f210bd790a3a39ec64b1f628d7b6", kill_on_drop: false }`
[INFO] [stdout] 9786ea44186b1d71a3d266623aa47f5f7211f210bd790a3a39ec64b1f628d7b6
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2cbac15f47bc6fbbb2beb76799b54d3ca486504e701a96157f93b60e1c8a4dac
[INFO] running `Command { std: "docker" "start" "-a" "2cbac15f47bc6fbbb2beb76799b54d3ca486504e701a96157f93b60e1c8a4dac", kill_on_drop: false }`
[INFO] [stderr]    Compiling psl v2.1.90
[INFO] [stderr]    Compiling xstr v0.1.11
[INFO] [stderr]    Compiling punycode v0.4.1
[INFO] [stderr]    Compiling xtld v0.1.6
[INFO] [stderr]    Compiling xmail v0.1.15 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/lib.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |         && let Ok(i) = punycode::decode(&i[3..])
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xmail` (lib) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2cbac15f47bc6fbbb2beb76799b54d3ca486504e701a96157f93b60e1c8a4dac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cbac15f47bc6fbbb2beb76799b54d3ca486504e701a96157f93b60e1c8a4dac", kill_on_drop: false }`
[INFO] [stdout] 2cbac15f47bc6fbbb2beb76799b54d3ca486504e701a96157f93b60e1c8a4dac