[INFO] fetching crate try_default 1.0.0...
[INFO] testing try_default-1.0.0 against beta-2023-04-20 for beta-1.70-1
[INFO] extracting crate try_default 1.0.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate try_default 1.0.0 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain
[INFO] started tweaking crates.io crate try_default 1.0.0
[INFO] finished tweaking crates.io crate try_default 1.0.0
[INFO] tweaked toml for crates.io crate try_default 1.0.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" __CARGO_TEST_CHANNEL_OVERRIDE_DO_NOT_USE_THIS="nightly" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6dcef2aa6eecc65ca5357fce1e51ba7cf3c85809a2f58cedcdf8a405efa8a9fe
[INFO] running `Command { std: "docker" "start" "-a" "6dcef2aa6eecc65ca5357fce1e51ba7cf3c85809a2f58cedcdf8a405efa8a9fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6dcef2aa6eecc65ca5357fce1e51ba7cf3c85809a2f58cedcdf8a405efa8a9fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dcef2aa6eecc65ca5357fce1e51ba7cf3c85809a2f58cedcdf8a405efa8a9fe", kill_on_drop: false }`
[INFO] [stdout] 6dcef2aa6eecc65ca5357fce1e51ba7cf3c85809a2f58cedcdf8a405efa8a9fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76508070a4eebf1aa2652a15ef803a2a0c13d175be2dc0589f2f46436a428fd8
[INFO] running `Command { std: "docker" "start" "-a" "76508070a4eebf1aa2652a15ef803a2a0c13d175be2dc0589f2f46436a428fd8", kill_on_drop: false }`
[INFO] [stderr]    Compiling try_default v1.0.0 (/opt/rustwide/workdir)
[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(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `try_default` (lib) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "76508070a4eebf1aa2652a15ef803a2a0c13d175be2dc0589f2f46436a428fd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76508070a4eebf1aa2652a15ef803a2a0c13d175be2dc0589f2f46436a428fd8", kill_on_drop: false }`
[INFO] [stdout] 76508070a4eebf1aa2652a15ef803a2a0c13d175be2dc0589f2f46436a428fd8
