[INFO] fetching crate zss 1.0.1...
[INFO] testing zss-1.0.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate zss 1.0.1 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate zss 1.0.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zss 1.0.1
[INFO] finished tweaking crates.io crate zss 1.0.1
[INFO] tweaked toml for crates.io crate zss 1.0.1 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] crate crates.io crate zss 1.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded simplelog v0.10.0
[INFO] [stderr]   Downloaded addr2line v0.15.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b607d8d24483605c2f20899b7ff16bf98572226a3e79737cc9f04b4dcebdfdbc
[INFO] running `Command { std: "docker" "start" "-a" "b607d8d24483605c2f20899b7ff16bf98572226a3e79737cc9f04b4dcebdfdbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b607d8d24483605c2f20899b7ff16bf98572226a3e79737cc9f04b4dcebdfdbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b607d8d24483605c2f20899b7ff16bf98572226a3e79737cc9f04b4dcebdfdbc", kill_on_drop: false }`
[INFO] [stdout] b607d8d24483605c2f20899b7ff16bf98572226a3e79737cc9f04b4dcebdfdbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74179cab67e3256bde9832581999007eac780668cf2de9c51002a5cc56c02bf4
[INFO] running `Command { std: "docker" "start" "-a" "74179cab67e3256bde9832581999007eac780668cf2de9c51002a5cc56c02bf4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling khronos_api v3.1.0
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]    Compiling gimli v0.24.0
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling weezl v0.1.5
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling object v0.24.0
[INFO] [stderr]    Compiling anyhow v1.0.42
[INFO] [stderr]    Compiling color_quant v1.1.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.20
[INFO] [stderr]    Compiling takeable-option v0.5.0
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling bytemuck v1.7.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling miniz_oxide v0.3.7
[INFO] [stderr]    Compiling deflate v0.8.6
[INFO] [stderr]    Compiling gif v0.11.2
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling png v0.16.8
[INFO] [stderr]    Compiling gl_generator v0.14.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling backtrace v0.3.59
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling glium v0.30.1
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling addr2line v0.15.2
[INFO] [stderr]    Compiling simplelog v0.10.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.22
[INFO] [stderr]    Compiling tiff v0.6.1
[INFO] [stderr]    Compiling image v0.23.14
[INFO] [stderr]    Compiling zss v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(format_args_capture, try_blocks, drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `format_args_capture` has been stable since 1.58.0 and no longer requires an attribute to enable
[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 `zss` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "74179cab67e3256bde9832581999007eac780668cf2de9c51002a5cc56c02bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74179cab67e3256bde9832581999007eac780668cf2de9c51002a5cc56c02bf4", kill_on_drop: false }`
[INFO] [stdout] 74179cab67e3256bde9832581999007eac780668cf2de9c51002a5cc56c02bf4