[INFO] fetching crate trait_cast_rs 0.2.4...
[INFO] testing trait_cast_rs-0.2.4 against 1.76.0 for beta-1.77-1
[INFO] extracting crate trait_cast_rs 0.2.4 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate trait_cast_rs 0.2.4 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate trait_cast_rs 0.2.4
[INFO] finished tweaking crates.io crate trait_cast_rs 0.2.4
[INFO] tweaked toml for crates.io crate trait_cast_rs 0.2.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate trait_cast_rs 0.2.4 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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded venial v0.4.0
[INFO] [stderr]   Downloaded trait_cast_impl_rs v0.2.1
[INFO] [stderr]   Downloaded const_closure v0.2.3
[INFO] [stderr]   Downloaded const_sort_rs v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c97e040d1a56be767c21fcdb9adf0d5f6d1fc93568e02379c10c3782a91ad64d
[INFO] running `Command { std: "docker" "start" "-a" "c97e040d1a56be767c21fcdb9adf0d5f6d1fc93568e02379c10c3782a91ad64d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c97e040d1a56be767c21fcdb9adf0d5f6d1fc93568e02379c10c3782a91ad64d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c97e040d1a56be767c21fcdb9adf0d5f6d1fc93568e02379c10c3782a91ad64d", kill_on_drop: false }`
[INFO] [stdout] c97e040d1a56be767c21fcdb9adf0d5f6d1fc93568e02379c10c3782a91ad64d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d610957ed09371da1237ec02917dd4cdc7056cd9ba354c6adf0cd8f868806a1
[INFO] running `Command { std: "docker" "start" "-a" "0d610957ed09371da1237ec02917dd4cdc7056cd9ba354c6adf0cd8f868806a1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling venial v0.4.0
[INFO] [stderr]    Compiling trait_cast_impl_rs v0.2.1
[INFO] [stderr]    Compiling trait_cast_rs v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:6:1
[INFO] [stdout]    |
[INFO] [stdout] 6  | / #![feature(
[INFO] [stdout] 7  | |   const_type_id,      // Needed to enable `TraitcastTarget::create` to be const
[INFO] [stdout] 8  | |   const_type_name,    // Needed for `Debug` implementation
[INFO] [stdout] 9  | |   trait_upcasting,    // Needed to avoid reimplementing Any
[INFO] [stdout] ...  |
[INFO] [stdout] 12 | |   doc_cfg             // For nicer Docs
[INFO] [stdout] 13 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:3
[INFO] [stdout]   |
[INFO] [stdout] 7 |   const_type_id,      // Needed to enable `TraitcastTarget::create` to be const
[INFO] [stdout]   |   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:3
[INFO] [stdout]   |
[INFO] [stdout] 8 |   const_type_name,    // Needed for `Debug` implementation
[INFO] [stdout]   |   ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `trait_cast_rs` (lib) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "0d610957ed09371da1237ec02917dd4cdc7056cd9ba354c6adf0cd8f868806a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d610957ed09371da1237ec02917dd4cdc7056cd9ba354c6adf0cd8f868806a1", kill_on_drop: false }`
[INFO] [stdout] 0d610957ed09371da1237ec02917dd4cdc7056cd9ba354c6adf0cd8f868806a1
