[INFO] cloning repository https://github.com/spica314/neco3
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/spica314/neco3" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 646fcf82146cb0f76cfc9ff7a695b561de1a515d
[INFO] testing spica314/neco3 against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3" "/workspace/builds/worker-103/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-103/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/spica314/neco3 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/spica314/neco3
[INFO] finished tweaking git repo https://github.com/spica314/neco3
[INFO] tweaked toml for git repo https://github.com/spica314/neco3 written to /workspace/builds/worker-103/source/Cargo.toml
[INFO] crate git repo https://github.com/spica314/neco3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f7ef429c49190c05fabf0c1fce7c50c119fcb7ae2dd43ec79be87ee8460be71
[INFO] running `Command { std: "docker" "start" "-a" "7f7ef429c49190c05fabf0c1fce7c50c119fcb7ae2dd43ec79be87ee8460be71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f7ef429c49190c05fabf0c1fce7c50c119fcb7ae2dd43ec79be87ee8460be71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f7ef429c49190c05fabf0c1fce7c50c119fcb7ae2dd43ec79be87ee8460be71", kill_on_drop: false }`
[INFO] [stdout] 7f7ef429c49190c05fabf0c1fce7c50c119fcb7ae2dd43ec79be87ee8460be71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a93032628c4fa55353c85ea75cc93a8206852e397d7bf4b8afb03873057864e1
[INFO] running `Command { std: "docker" "start" "-a" "a93032628c4fa55353c85ea75cc93a8206852e397d7bf4b8afb03873057864e1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling neco-table v0.1.0 (/opt/rustwide/workdir/src/neco-table)
[INFO] [stderr]    Compiling neco v0.1.0 (/opt/rustwide/workdir/src/neco)
[INFO] [stderr]    Compiling neco-ir v0.1.0 (/opt/rustwide/workdir/src/neco-ir)
[INFO] [stderr]    Compiling neco-types-and-values v0.1.0 (/opt/rustwide/workdir/src/neco-types-and-values)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/neco-types-and-values/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling neco-syn v0.1.0 (/opt/rustwide/workdir/src/neco-syn)
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/neco-types-and-values/src/bit_vector.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn len(&self) -> usize {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 33 |         self.len()
[INFO] [stdout]    |         ---------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/neco-syn/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `neco-syn`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a93032628c4fa55353c85ea75cc93a8206852e397d7bf4b8afb03873057864e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a93032628c4fa55353c85ea75cc93a8206852e397d7bf4b8afb03873057864e1", kill_on_drop: false }`
[INFO] [stdout] a93032628c4fa55353c85ea75cc93a8206852e397d7bf4b8afb03873057864e1
