[INFO] fetching crate icentral-timing-update 0.1.0...
[INFO] testing icentral-timing-update-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate icentral-timing-update 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate icentral-timing-update 0.1.0
[INFO] finished tweaking crates.io crate icentral-timing-update 0.1.0
[INFO] tweaked toml for crates.io crate icentral-timing-update 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate icentral-timing-update 0.1.0 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] crate crates.io crate icentral-timing-update 0.1.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded icentral-workspace-map v0.1.0
[INFO] [stderr]   Downloaded icentral-workspace v0.1.0
[INFO] [stderr]   Downloaded icentral-node-stack v0.1.0
[INFO] [stderr]   Downloaded icentral-component v0.1.0
[INFO] [stderr]   Downloaded icentral-sigmas v0.1.0
[INFO] [stderr]   Downloaded icentral-parents-map v0.1.0
[INFO] [stderr]   Downloaded icentral-deltas v0.1.0
[INFO] [stderr]   Downloaded icentral-node-queue v0.1.0
[INFO] [stderr]   Downloaded icentral-scores v0.1.0
[INFO] [stderr]   Downloaded icentral-mucid-map v0.1.0
[INFO] [stderr]   Downloaded icentral-timer v0.1.0
[INFO] [stderr]   Downloaded icentral-delta v0.1.0
[INFO] [stderr]   Downloaded icentral-subgraph-map v0.1.0
[INFO] [stderr]   Downloaded icentral-operation v0.1.0
[INFO] [stderr]   Downloaded icentral-mock v0.1.0
[INFO] [stderr]   Downloaded icentral-calculate-bc-mem v0.1.0
[INFO] [stderr]   Downloaded icentral-scratch v0.1.0
[INFO] [stderr]   Downloaded icentral-bridge-edges v0.1.0
[INFO] [stderr]   Downloaded icentral-bc-mem v0.1.0
[INFO] [stderr]   Downloaded icentral-rbfs v0.1.0
[INFO] [stderr]   Downloaded icentral-gen-rand-edges v0.1.0
[INFO] [stderr]   Downloaded icentral-brandes v0.1.0
[INFO] [stderr]   Downloaded icentral-articulation-point v0.1.0
[INFO] [stderr]   Downloaded icentral-muc v0.1.0
[INFO] [stderr]   Downloaded icentral-graph v0.1.0
[INFO] [stderr]   Downloaded icentral-subgraph v0.1.0
[INFO] [stderr]   Downloaded icentral-bbfs v0.1.0
[INFO] [stderr]   Downloaded icentral-articulation-point-map v0.1.0
[INFO] [stderr]   Downloaded icentral-pair-dependencies v0.1.0
[INFO] [stderr]   Downloaded icentral-path-counts v0.1.0
[INFO] [stderr]   Downloaded icentral-conn-vertex-map v0.1.0
[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] e77456d0eb68491db89095a874c99379e074ed363eaab796f509860c35e9173c
[INFO] running `Command { std: "docker" "start" "-a" "e77456d0eb68491db89095a874c99379e074ed363eaab796f509860c35e9173c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e77456d0eb68491db89095a874c99379e074ed363eaab796f509860c35e9173c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e77456d0eb68491db89095a874c99379e074ed363eaab796f509860c35e9173c", kill_on_drop: false }`
[INFO] [stdout] e77456d0eb68491db89095a874c99379e074ed363eaab796f509860c35e9173c
[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] 73388ab70f8abfe01ae26542fc34d7ea03eb1efcc416b8b0f7e872b36e6dffb1
[INFO] running `Command { std: "docker" "start" "-a" "73388ab70f8abfe01ae26542fc34d7ea03eb1efcc416b8b0f7e872b36e6dffb1", kill_on_drop: false }`
[INFO] [stderr]    Compiling nalgebra v0.31.4
[INFO] [stderr]    Compiling tracing-setup v0.3.6
[INFO] [stderr]    Compiling named-item v0.1.0
[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/named-item-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(associated_type_defaults)]
[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 `named-item` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "73388ab70f8abfe01ae26542fc34d7ea03eb1efcc416b8b0f7e872b36e6dffb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73388ab70f8abfe01ae26542fc34d7ea03eb1efcc416b8b0f7e872b36e6dffb1", kill_on_drop: false }`
[INFO] [stdout] 73388ab70f8abfe01ae26542fc34d7ea03eb1efcc416b8b0f7e872b36e6dffb1