[INFO] fetching crate hkalbasi-rustc-ap-rustc_index 0.0.20230517...
[INFO] testing hkalbasi-rustc-ap-rustc_index-0.0.20230517 against 1.90.0 for beta-1.91-3
[INFO] extracting crate hkalbasi-rustc-ap-rustc_index 0.0.20230517 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate hkalbasi-rustc-ap-rustc_index 0.0.20230517
[INFO] finished tweaking crates.io crate hkalbasi-rustc-ap-rustc_index 0.0.20230517
[INFO] tweaked toml for crates.io crate hkalbasi-rustc-ap-rustc_index 0.0.20230517 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate hkalbasi-rustc-ap-rustc_index 0.0.20230517 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 13 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thin-vec v0.2.14
[INFO] [stderr]   Downloaded hkalbasi-rustc-ap-rustc_serialize v0.0.20230517
[INFO] [stderr]   Downloaded hkalbasi-rustc-ap-rustc_macros v0.0.20230517
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1c50ca467d30f8772b5b4f33852006cb6acc39158e618222cf1abe7cb8c8881d
[INFO] running `Command { std: "docker" "start" "-a" "1c50ca467d30f8772b5b4f33852006cb6acc39158e618222cf1abe7cb8c8881d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c50ca467d30f8772b5b4f33852006cb6acc39158e618222cf1abe7cb8c8881d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c50ca467d30f8772b5b4f33852006cb6acc39158e618222cf1abe7cb8c8881d", kill_on_drop: false }`
[INFO] [stdout] 1c50ca467d30f8772b5b4f33852006cb6acc39158e618222cf1abe7cb8c8881d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64c30aafabd2fc424f7bd2b310ca1d1d5f2a74cd3a1c55189dd7fdccdeedf57f
[INFO] running `Command { std: "docker" "start" "-a" "64c30aafabd2fc424f7bd2b310ca1d1d5f2a74cd3a1c55189dd7fdccdeedf57f", kill_on_drop: false }`
[INFO] [stderr]    Compiling thin-vec v0.2.14
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/smallvec-1.15.1/src/lib.rs:96:37
[INFO] [stdout]    |
[INFO] [stdout] 96 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[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 `smallvec` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "64c30aafabd2fc424f7bd2b310ca1d1d5f2a74cd3a1c55189dd7fdccdeedf57f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64c30aafabd2fc424f7bd2b310ca1d1d5f2a74cd3a1c55189dd7fdccdeedf57f", kill_on_drop: false }`
[INFO] [stdout] 64c30aafabd2fc424f7bd2b310ca1d1d5f2a74cd3a1c55189dd7fdccdeedf57f