[INFO] cloning repository https://github.com/WesleyCh3n/rust-toys
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WesleyCh3n/rust-toys" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWesleyCh3n%2Frust-toys", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWesleyCh3n%2Frust-toys'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2705202d3e44263812afd9fba8b4116dfd9e1a28
[INFO] checking WesleyCh3n/rust-toys/2705202d3e44263812afd9fba8b4116dfd9e1a28 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWesleyCh3n%2Frust-toys" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WesleyCh3n/rust-toys on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/WesleyCh3n/rust-toys
[INFO] finished tweaking git repo https://github.com/WesleyCh3n/rust-toys
[INFO] tweaked toml for git repo https://github.com/WesleyCh3n/rust-toys written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/WesleyCh3n/rust-toys 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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unsafe-libyaml v0.2.5
[INFO] [stderr]   Downloaded serde_yaml v0.9.16
[INFO] [stderr]   Downloaded syn v1.0.104
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b4c91bde25a33392970a874900d6f2128c0e35b16d27e6ea56f1bfc35aff51d
[INFO] running `Command { std: "docker" "start" "-a" "8b4c91bde25a33392970a874900d6f2128c0e35b16d27e6ea56f1bfc35aff51d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b4c91bde25a33392970a874900d6f2128c0e35b16d27e6ea56f1bfc35aff51d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b4c91bde25a33392970a874900d6f2128c0e35b16d27e6ea56f1bfc35aff51d", kill_on_drop: false }`
[INFO] [stdout] 8b4c91bde25a33392970a874900d6f2128c0e35b16d27e6ea56f1bfc35aff51d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 75927ff02246eb29ebae6add93a6ab84e065e6200dcc6ee4f927bdb6079af657
[INFO] running `Command { std: "docker" "start" "-a" "75927ff02246eb29ebae6add93a6ab84e065e6200dcc6ee4f927bdb6079af657", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling syn v1.0.104
[INFO] [stderr]    Compiling serde v1.0.147
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.47/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_json v1.0.89
[INFO] [stderr]     Checking itoa v1.0.4
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking unsafe-libyaml v0.2.5
[INFO] [stderr]     Checking iter-dir v0.1.0 (/opt/rustwide/workdir/iter-dir)
[INFO] [stderr]     Checking recursion v0.1.0 (/opt/rustwide/workdir/recursion)
[INFO] [stderr]     Checking atomic-bool v0.1.0 (/opt/rustwide/workdir/atomic-bool)
[INFO] [stderr]     Checking channel v0.1.0 (/opt/rustwide/workdir/channel)
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]     Checking mutex-and-arc v0.1.0 (/opt/rustwide/workdir/mutex-and-arc)
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `hdl`
[INFO] [stdout]   --> channel/src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let hdl = std::thread::spawn(move || loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hdl`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hdl`
[INFO] [stdout]   --> channel/src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let hdl = std::thread::spawn(move || loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hdl`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "75927ff02246eb29ebae6add93a6ab84e065e6200dcc6ee4f927bdb6079af657", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75927ff02246eb29ebae6add93a6ab84e065e6200dcc6ee4f927bdb6079af657", kill_on_drop: false }`
[INFO] [stdout] 75927ff02246eb29ebae6add93a6ab84e065e6200dcc6ee4f927bdb6079af657