[INFO] fetching crate rsflex 0.3.0...
[INFO] testing rsflex-0.3.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate rsflex 0.3.0 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate rsflex 0.3.0 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 crates.io crate rsflex 0.3.0
[INFO] finished tweaking crates.io crate rsflex 0.3.0
[INFO] tweaked toml for crates.io crate rsflex 0.3.0 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate crates.io crate rsflex 0.3.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] ffd83c13a8950c9e3324bf1be7dfde89e37f839d4e0be3e9595b5d4803dea74d
[INFO] running `Command { std: "docker" "start" "-a" "ffd83c13a8950c9e3324bf1be7dfde89e37f839d4e0be3e9595b5d4803dea74d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffd83c13a8950c9e3324bf1be7dfde89e37f839d4e0be3e9595b5d4803dea74d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffd83c13a8950c9e3324bf1be7dfde89e37f839d4e0be3e9595b5d4803dea74d", kill_on_drop: false }`
[INFO] [stdout] ffd83c13a8950c9e3324bf1be7dfde89e37f839d4e0be3e9595b5d4803dea74d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] d1e3f90bdde4d6a4ab0f318e5e5cb60f8d6ed94d1fd19266461d3c452f55d4a8
[INFO] running `Command { std: "docker" "start" "-a" "d1e3f90bdde4d6a4ab0f318e5e5cb60f8d6ed94d1fd19266461d3c452f55d4a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling cmd_lib_core v0.1.0
[INFO] [stderr]    Compiling regex-syntax v0.6.22
[INFO] [stderr]    Compiling thread_local v1.1.3
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling libmimalloc-sys v0.1.20
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling cmd_lib_macros v0.1.0
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/cmd_lib_macros-0.1.0/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span)]
[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 `cmd_lib_macros` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "d1e3f90bdde4d6a4ab0f318e5e5cb60f8d6ed94d1fd19266461d3c452f55d4a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1e3f90bdde4d6a4ab0f318e5e5cb60f8d6ed94d1fd19266461d3c452f55d4a8", kill_on_drop: false }`
[INFO] [stdout] d1e3f90bdde4d6a4ab0f318e5e5cb60f8d6ed94d1fd19266461d3c452f55d4a8