[INFO] fetching crate string-alloc 0.0.3...
[INFO] testing string-alloc-0.0.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate string-alloc 0.0.3 into /workspace/builds/worker-7-tc2/source
[INFO] removed /workspace/builds/worker-7-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate string-alloc 0.0.3
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate string-alloc 0.0.3
[INFO] tweaked toml for crates.io crate string-alloc 0.0.3 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate string-alloc 0.0.3 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] crate crates.io crate string-alloc 0.0.3 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-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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 8b14036987cf336a8f7a6ea9d926bc7e427e143e3af9f4469c41e88e30960f3a
[INFO] running `Command { std: "docker" "start" "-a" "8b14036987cf336a8f7a6ea9d926bc7e427e143e3af9f4469c41e88e30960f3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b14036987cf336a8f7a6ea9d926bc7e427e143e3af9f4469c41e88e30960f3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b14036987cf336a8f7a6ea9d926bc7e427e143e3af9f4469c41e88e30960f3a", kill_on_drop: false }`
[INFO] [stdout] 8b14036987cf336a8f7a6ea9d926bc7e427e143e3af9f4469c41e88e30960f3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 5049f9d6255d06f8283983ce196df3f8e56cf67d59f5ec20fe4b4cb5b391162c
[INFO] running `Command { std: "docker" "start" "-a" "5049f9d6255d06f8283983ce196df3f8e56cf67d59f5ec20fe4b4cb5b391162c", kill_on_drop: false }`
[INFO] [stderr]    Compiling string-alloc v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:86:1
[INFO] [stdout]    |
[INFO] [stdout] 86 | #![feature(allocator_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `string-alloc` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "5049f9d6255d06f8283983ce196df3f8e56cf67d59f5ec20fe4b4cb5b391162c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5049f9d6255d06f8283983ce196df3f8e56cf67d59f5ec20fe4b4cb5b391162c", kill_on_drop: false }`
[INFO] [stdout] 5049f9d6255d06f8283983ce196df3f8e56cf67d59f5ec20fe4b4cb5b391162c
