[INFO] cloning repository https://github.com/Kroisse/urashima
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kroisse/urashima" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKroisse%2Furashima", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKroisse%2Furashima'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8fffb9e24e71792338f484a79f3a86379548314d
[INFO] testing Kroisse/urashima against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKroisse%2Furashima" "/workspace/builds/worker-49/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-49/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Kroisse/urashima on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Kroisse/urashima
[INFO] finished tweaking git repo https://github.com/Kroisse/urashima
[INFO] tweaked toml for git repo https://github.com/Kroisse/urashima written to /workspace/builds/worker-49/source/Cargo.toml
[INFO] crate git repo https://github.com/Kroisse/urashima already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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 new_debug_unreachable v1.0.3
[INFO] [stderr]   Downloaded tokio-trace-core v0.2.0
[INFO] [stderr]   Downloaded tokio-threadpool v0.1.14
[INFO] [stderr]   Downloaded proc-macro-hack v0.5.7
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.47
[INFO] [stderr]   Downloaded cty v0.1.5
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.47
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded backtrace v0.3.32
[INFO] [stderr]   Downloaded cstr_core v0.1.2
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.47
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.47
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.47
[INFO] [stderr]   Downloaded bumpalo v2.4.3
[INFO] [stderr]   Downloaded url_serde v0.2.0
[INFO] [stderr]   Downloaded weedle v0.9.0
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded tokio-executor v0.1.7
[INFO] [stderr]   Downloaded serde_yaml v0.8.9
[INFO] [stderr]   Downloaded web-sys v0.3.24
[INFO] [stderr]   Downloaded js-sys v0.3.24
[INFO] [stderr]   Downloaded ucd-trie v0.1.1
[INFO] [stderr]   Downloaded crossbeam-epoch v0.7.1
[INFO] [stderr]   Downloaded tokio v0.1.21
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded chashmap v2.2.2
[INFO] [stderr]   Downloaded guard v0.5.0
[INFO] [stderr]   Downloaded jsonrpc-core v12.0.0
[INFO] [stderr]   Downloaded generational-arena v0.2.2
[INFO] [stderr]   Downloaded serde_derive_state v0.4.6
[INFO] [stderr]   Downloaded lsp-types v0.58.0
[INFO] [stderr]   Downloaded serde_state v0.4.6
[INFO] [stderr]   Downloaded pest v2.1.1
[INFO] [stderr]   Downloaded num-bigint v0.2.2
[INFO] [stderr]   Downloaded backtrace-sys v0.1.29
[INFO] [stderr]   Downloaded pest_meta v2.1.1
[INFO] [stderr]   Downloaded cbindgen v0.9.0
[INFO] [stderr]   Downloaded pest_generator v2.1.0
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.47
[INFO] [stderr]   Downloaded wee_alloc v0.4.4
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92ff63b7b4d26aeb3c9495a3acfcd07412cc0148e2559e9fc4e1200c3b6fb749
[INFO] running `Command { std: "docker" "start" "-a" "92ff63b7b4d26aeb3c9495a3acfcd07412cc0148e2559e9fc4e1200c3b6fb749", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92ff63b7b4d26aeb3c9495a3acfcd07412cc0148e2559e9fc4e1200c3b6fb749", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92ff63b7b4d26aeb3c9495a3acfcd07412cc0148e2559e9fc4e1200c3b6fb749", kill_on_drop: false }`
[INFO] [stdout] 92ff63b7b4d26aeb3c9495a3acfcd07412cc0148e2559e9fc4e1200c3b6fb749
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9bc016dd70aa09aab812cb2b90f566e44f8da71c530dd5309f80ae8809e99e2
[INFO] running `Command { std: "docker" "start" "-a" "c9bc016dd70aa09aab812cb2b90f566e44f8da71c530dd5309f80ae8809e99e2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling syn v0.15.38
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling serde v1.0.93
[INFO] [stderr]    Compiling ucd-trie v0.1.1
[INFO] [stderr]    Compiling maplit v1.0.1
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.3
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling generational-arena v0.2.2
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/generational-arena-0.2.2/src/lib.rs:146:35
[INFO] [stdout]     |
[INFO] [stdout] 146 | #![cfg_attr(not(feature = "std"), feature(alloc))]
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `generational-arena` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c9bc016dd70aa09aab812cb2b90f566e44f8da71c530dd5309f80ae8809e99e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9bc016dd70aa09aab812cb2b90f566e44f8da71c530dd5309f80ae8809e99e2", kill_on_drop: false }`
[INFO] [stdout] c9bc016dd70aa09aab812cb2b90f566e44f8da71c530dd5309f80ae8809e99e2