[INFO] fetching crate pi_link_list 0.1.9...
[INFO] testing pi_link_list-0.1.9 against 1.91.0 for beta-1.92-2
[INFO] extracting crate pi_link_list 0.1.9 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate pi_link_list 0.1.9
[INFO] finished tweaking crates.io crate pi_link_list 0.1.9
[INFO] tweaked toml for crates.io crate pi_link_list 0.1.9 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate pi_link_list 0.1.9 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 25 packages to latest compatible versions
[INFO] [stderr]       Adding getrandom v0.2.16 (available: v0.3.4)
[INFO] [stderr]       Adding pi_slotmap v0.1.17 (available: v0.2.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive-deref-rs v0.1.1
[INFO] [stderr]   Downloaded pi_key_alloter v0.5.2
[INFO] [stderr]   Downloaded pi_print_any v0.1.2
[INFO] [stderr]   Downloaded pi_null v0.1.12
[INFO] [stderr]   Downloaded pi_share v0.4.16
[INFO] [stderr]   Downloaded pi_slotmap v0.1.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c91c2ae70e8025968006c03a34b765fafc5714a9c27e040b3183c766e134462f
[INFO] running `Command { std: "docker" "start" "-a" "c91c2ae70e8025968006c03a34b765fafc5714a9c27e040b3183c766e134462f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c91c2ae70e8025968006c03a34b765fafc5714a9c27e040b3183c766e134462f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c91c2ae70e8025968006c03a34b765fafc5714a9c27e040b3183c766e134462f", kill_on_drop: false }`
[INFO] [stdout] c91c2ae70e8025968006c03a34b765fafc5714a9c27e040b3183c766e134462f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2428c3676bbcb8893acfeae2da0e102ad7baaae6bd9081ffeb7fc8e781975507
[INFO] running `Command { std: "docker" "start" "-a" "2428c3676bbcb8893acfeae2da0e102ad7baaae6bd9081ffeb7fc8e781975507", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling libc v0.2.177
[INFO] [stderr]    Compiling pi_null v0.1.12
[INFO] [stderr]    Compiling pi_print_any v0.1.2
[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/pi_print_any-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `pi_print_any` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2428c3676bbcb8893acfeae2da0e102ad7baaae6bd9081ffeb7fc8e781975507", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2428c3676bbcb8893acfeae2da0e102ad7baaae6bd9081ffeb7fc8e781975507", kill_on_drop: false }`
[INFO] [stdout] 2428c3676bbcb8893acfeae2da0e102ad7baaae6bd9081ffeb7fc8e781975507