[INFO] cloning repository https://github.com/lark-exploration/lark
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lark-exploration/lark" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flark-exploration%2Flark", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flark-exploration%2Flark'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 87d1e42107ced29f5ef23b70ef66e3b6fa2e74de
[INFO] checking lark-exploration/lark against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flark-exploration%2Flark" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lark-exploration/lark on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lark-exploration/lark
[INFO] removed workspace from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-cli from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-debug-derive from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-debug-with from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-entity from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-hir from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-intern from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-language-server from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-parser from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-query-system from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-span from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-string from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-test from git repo https://github.com/lark-exploration/lark
[INFO] removed path dependency lark-test-generate from git repo https://github.com/lark-exploration/lark
[INFO] finished tweaking git repo https://github.com/lark-exploration/lark
[INFO] tweaked toml for git repo https://github.com/lark-exploration/lark written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/lark-exploration/lark already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /workspace/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unindent v0.1.7
[INFO] [stderr]   Downloaded datafrog v2.0.1
[INFO] [stderr]   Downloaded diff v0.1.12
[INFO] [stderr]   Downloaded generational-arena v0.2.8
[INFO] [stderr]   Downloaded lark-ty v0.1.0
[INFO] [stderr]   Downloaded render-tree v0.1.1
[INFO] [stderr]   Downloaded flexi_logger v0.10.7
[INFO] [stderr]   Downloaded lark-intern v0.1.0
[INFO] [stderr]   Downloaded lark-test v0.1.0
[INFO] [stderr]   Downloaded lark-debug-derive v0.1.0
[INFO] [stderr]   Downloaded lark-string v0.1.0
[INFO] [stderr]   Downloaded lark-pretty-print v0.1.0
[INFO] [stderr]   Downloaded lark-build v0.1.0
[INFO] [stderr]   Downloaded language-reporting v0.3.1
[INFO] [stderr]   Downloaded lark-entity v0.1.0
[INFO] [stderr]   Downloaded lark-collections v0.1.0
[INFO] [stderr]   Downloaded lark-unify v0.1.0
[INFO] [stderr]   Downloaded lark-cli v0.1.0
[INFO] [stderr]   Downloaded lark-language-server v0.1.0
[INFO] [stderr]   Downloaded lark-span v0.1.0
[INFO] [stderr]   Downloaded lark-query-system v0.1.0
[INFO] [stderr]   Downloaded lark-error v0.1.0
[INFO] [stderr]   Downloaded lark-eval v0.1.0
[INFO] [stderr]   Downloaded lark-debug-with v0.1.0
[INFO] [stderr]   Downloaded lark-hir v0.1.0
[INFO] [stderr]   Downloaded lark-test-generate v0.1.0
[INFO] [stderr]   Downloaded lark-actor v0.1.0
[INFO] [stderr]   Downloaded languageserver-types v0.53.1
[INFO] [stderr]   Downloaded salsa v0.9.2
[INFO] [stderr]   Downloaded lark-type-check v0.1.0
[INFO] [stderr]   Downloaded languageserver-types v0.54.0
[INFO] [stderr]   Downloaded lark-parser v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a81329fbcbfb5f70e9bc0a8685433918003eb48a2ab42c1d512e3ae21ead3726
[INFO] running `Command { std: "docker" "start" "-a" "a81329fbcbfb5f70e9bc0a8685433918003eb48a2ab42c1d512e3ae21ead3726", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a81329fbcbfb5f70e9bc0a8685433918003eb48a2ab42c1d512e3ae21ead3726", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a81329fbcbfb5f70e9bc0a8685433918003eb48a2ab42c1d512e3ae21ead3726", kill_on_drop: false }`
[INFO] [stdout] a81329fbcbfb5f70e9bc0a8685433918003eb48a2ab42c1d512e3ae21ead3726
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dfc6eed5414569ef15460e8f64616113d734edc2dd8d916a99eeee0ddd65c63
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6dfc6eed5414569ef15460e8f64616113d734edc2dd8d916a99eeee0ddd65c63", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]     Checking datafrog v2.0.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.21
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking cc v1.0.62
[INFO] [stderr]     Checking glob v0.2.11
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling generational-arena v0.2.8
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]     Checking tinyvec v1.0.1
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling crossbeam-utils v0.8.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.14
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]    Compiling lark-debug-with v0.1.0
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]     Checking aho-corasick v0.7.15
[INFO] [stderr]    Compiling derive-new v0.5.8
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.4.6
[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/lark-debug-with-0.1.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/lark-debug-with-0.1.0/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/lark-debug-with-0.1.0/src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(in_band_lifetimes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/lark-debug-with-0.1.0/src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lark-debug-with`
[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] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6dfc6eed5414569ef15460e8f64616113d734edc2dd8d916a99eeee0ddd65c63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dfc6eed5414569ef15460e8f64616113d734edc2dd8d916a99eeee0ddd65c63", kill_on_drop: false }`
[INFO] [stdout] 6dfc6eed5414569ef15460e8f64616113d734edc2dd8d916a99eeee0ddd65c63