[INFO] cloning repository https://github.com/evan-a-w/gc_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/evan-a-w/gc_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fevan-a-w%2Fgc_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fevan-a-w%2Fgc_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4155c6b5b302a039ef27d054c014d9c71e3462e0
[INFO] testing evan-a-w/gc_rs against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fevan-a-w%2Fgc_rs" "/workspace/builds/worker-21/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-21/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/evan-a-w/gc_rs on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/evan-a-w/gc_rs
[INFO] finished tweaking git repo https://github.com/evan-a-w/gc_rs
[INFO] tweaked toml for git repo https://github.com/evan-a-w/gc_rs written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] crate git repo https://github.com/evan-a-w/gc_rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1831d28dc077623f1c19cd849437c1e940dd192014081287b4def4097acbc204
[INFO] running `Command { std: "docker" "start" "-a" "1831d28dc077623f1c19cd849437c1e940dd192014081287b4def4097acbc204", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1831d28dc077623f1c19cd849437c1e940dd192014081287b4def4097acbc204", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1831d28dc077623f1c19cd849437c1e940dd192014081287b4def4097acbc204", kill_on_drop: false }`
[INFO] [stdout] 1831d28dc077623f1c19cd849437c1e940dd192014081287b4def4097acbc204
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 555360bbe21998469163e0c6735e69d8a69b5eac3645ba3018dcf84bf1e540c2
[INFO] running `Command { std: "docker" "start" "-a" "555360bbe21998469163e0c6735e69d8a69b5eac3645ba3018dcf84bf1e540c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.85
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling gc_rs_derive v0.1.0 (/opt/rustwide/workdir/gc_rs_derive)
[INFO] [stdout] warning: unused import: `proc_macro2::TokenStream`
[INFO] [stdout]  --> gc_rs_derive/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use proc_macro2::TokenStream;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling gc_rs v0.1.0 (/opt/rustwide/workdir/gc_rs)
[INFO] [stdout] warning: unused import: `RefCell`
[INFO] [stdout]  --> gc_rs/src/gc.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]  --> gc_rs/src/gc.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::marker::PhantomData;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> gc_rs/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(log_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc_rs` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "555360bbe21998469163e0c6735e69d8a69b5eac3645ba3018dcf84bf1e540c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "555360bbe21998469163e0c6735e69d8a69b5eac3645ba3018dcf84bf1e540c2", kill_on_drop: false }`
[INFO] [stdout] 555360bbe21998469163e0c6735e69d8a69b5eac3645ba3018dcf84bf1e540c2